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1913 | jaeger | 1 | #include |
2 | #ifndef M_E |
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3 | #define M_E 2.7182818284590452354 |
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4 | #endif |
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5 | #ifndef M_PI |
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6 | #define M_PI 3.14159265358979323846 |
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7 | #endif |
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8 | |||
9 | #include |
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10 | |||
11 | /* |
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12 | * template for tinypy math functions |
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13 | * with one parameter. |
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14 | * |
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15 | * @cfunc is the coresponding function name in C |
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16 | * math library. |
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17 | */ |
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18 | #define TP_MATH_FUNC1(cfunc) \ |
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19 | static tp_obj math_##cfunc(TP) { \ |
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20 | double x = TP_NUM(); \ |
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21 | double r = 0.0; \ |
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22 | \ |
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23 | errno = 0; \ |
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24 | r = cfunc(x); \ |
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25 | if (errno == EDOM || errno == ERANGE) { \ |
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26 | tp_raise(tp_None, "%s(x): x=%f, " \ |
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27 | "out of range", __func__, x); \ |
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28 | } \ |
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29 | \ |
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30 | return (tp_number(r)); \ |
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31 | } |
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32 | |||
33 | /* |
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34 | * template for tinypy math functions |
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35 | * with two parameters. |
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36 | * |
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37 | * @cfunc is the coresponding function name in C |
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38 | * math library. |
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39 | */ |
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40 | #define TP_MATH_FUNC2(cfunc) \ |
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41 | static tp_obj math_##cfunc(TP) { \ |
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42 | double x = TP_NUM(); \ |
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43 | double y = TP_NUM(); \ |
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44 | double r = 0.0; \ |
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45 | \ |
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46 | errno = 0; \ |
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47 | r = cfunc(x, y); \ |
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48 | if (errno == EDOM || errno == ERANGE) { \ |
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49 | tp_raise(tp_None, "%s(x, y): x=%f,y=%f " \ |
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50 | "out of range", __func__, x, y);\ |
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51 | } \ |
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52 | \ |
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53 | return (tp_number(r)); \ |
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54 | } |
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55 | |||
56 | |||
57 | /* |
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58 | * PI definition: 3.1415926535897931 |
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59 | */ |
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60 | static tp_obj math_pi; |
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61 | |||
62 | /* |
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63 | * E definition: 2.7182818284590451 |
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64 | */ |
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65 | static tp_obj math_e; |
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66 | |||
67 | /* |
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68 | * acos(x) |
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69 | * |
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70 | * return arc cosine of x, return value is measured in radians. |
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71 | * if x falls out -1 to 1, raise out-of-range exception. |
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72 | */ |
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73 | TP_MATH_FUNC1(acos) |
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74 | |||
75 | /* |
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76 | * asin(x) |
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77 | * |
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78 | * return arc sine of x, measured in radians, actually [-PI/2, PI/2] |
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79 | * if x falls out of -1 to 1, raise out-of-range exception |
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80 | */ |
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81 | TP_MATH_FUNC1(asin) |
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82 | |||
83 | /* |
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84 | * atan(x) |
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85 | * |
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86 | * return arc tangent of x, measured in radians, |
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87 | */ |
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88 | TP_MATH_FUNC1(atan) |
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89 | |||
90 | /* |
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91 | * atan2(x, y) |
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92 | * |
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93 | * return arc tangent of x/y, measured in radians. |
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94 | * unlike atan(x/y), both the signs of x and y |
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95 | * are considered to determine the quaderant of |
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96 | * the result. |
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97 | */ |
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98 | TP_MATH_FUNC2(atan2) |
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99 | |||
100 | /* |
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101 | * ceil(x) |
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102 | * |
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103 | * return the ceiling of x, i.e, the smallest |
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104 | * integer >= x. |
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105 | */ |
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106 | TP_MATH_FUNC1(ceil) |
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107 | |||
108 | /* |
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109 | * cos(x) |
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110 | * |
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111 | * return cosine of x. x is measured in radians. |
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112 | */ |
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113 | TP_MATH_FUNC1(cos) |
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114 | |||
115 | /* |
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116 | * cosh(x) |
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117 | * |
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118 | * return hyperbolic cosine of x. |
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119 | */ |
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120 | TP_MATH_FUNC1(cosh) |
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121 | |||
122 | /* |
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123 | * degrees(x) |
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124 | * |
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125 | * converts angle x from radians to degrees. |
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126 | * NOTE: this function is introduced by python, |
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127 | * so we cannot wrap it directly in TP_MATH_FUNC1(), |
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128 | * here the solution is defining a new |
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129 | * C function - degrees(). |
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130 | */ |
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131 | static const double degToRad = |
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132 | 3.141592653589793238462643383 / 180.0; |
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133 | static double degrees(double x) |
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134 | { |
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135 | return (x / degToRad); |
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136 | } |
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137 | |||
138 | TP_MATH_FUNC1(degrees) |
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139 | |||
140 | /* |
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141 | * exp(x) |
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142 | * |
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143 | * return the value e raised to power of x. |
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144 | * e is the base of natural logarithms. |
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145 | */ |
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146 | TP_MATH_FUNC1(exp) |
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147 | |||
148 | /* |
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149 | * fabs(x) |
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150 | * |
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151 | * return the absolute value of x. |
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152 | */ |
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153 | TP_MATH_FUNC1(fabs) |
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154 | |||
155 | /* |
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156 | * floor(x) |
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157 | * |
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158 | * return the floor of x, i.e, the largest integer <= x |
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159 | */ |
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160 | TP_MATH_FUNC1(floor) |
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161 | |||
162 | /* |
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163 | * fmod(x, y) |
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164 | * |
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165 | * return the remainder of dividing x by y. that is, |
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166 | * return x - n * y, where n is the quotient of x/y. |
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167 | * NOTE: this function relies on the underlying platform. |
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168 | */ |
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169 | TP_MATH_FUNC2(fmod) |
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170 | |||
171 | /* |
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172 | * frexp(x) |
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173 | * |
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174 | * return a pair (r, y), which satisfies: |
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175 | * x = r * (2 ** y), and r is normalized fraction |
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176 | * which is laid between 1/2 <= abs(r) < 1. |
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177 | * if x = 0, the (r, y) = (0, 0). |
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178 | */ |
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179 | static tp_obj math_frexp(TP) { |
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180 | double x = TP_NUM(); |
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181 | int y = 0; |
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182 | double r = 0.0; |
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183 | tp_obj rList = tp_list(tp); |
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184 | |||
185 | errno = 0; |
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186 | r = frexp(x, &y); |
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187 | if (errno == EDOM || errno == ERANGE) { |
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188 | tp_raise(tp_None, "%s(x): x=%f, " |
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189 | "out of range", __func__, x); |
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190 | } |
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191 | |||
192 | _tp_list_append(tp, rList.list.val, tp_number(r)); |
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193 | _tp_list_append(tp, rList.list.val, tp_number((tp_num)y)); |
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194 | return (rList); |
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195 | } |
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196 | |||
197 | |||
198 | /* |
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199 | * hypot(x, y) |
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200 | * |
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201 | * return Euclidean distance, namely, |
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202 | * sqrt(x*x + y*y) |
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203 | */ |
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204 | TP_MATH_FUNC2(hypot) |
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205 | |||
206 | |||
207 | /* |
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208 | * ldexp(x, y) |
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209 | * |
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210 | * return the result of multiplying x by 2 |
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211 | * raised to y. |
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212 | */ |
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213 | TP_MATH_FUNC2(ldexp) |
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214 | |||
215 | /* |
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216 | * log(x, [base]) |
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217 | * |
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218 | * return logarithm of x to given base. If base is |
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219 | * not given, return the natural logarithm of x. |
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220 | * Note: common logarithm(log10) is used to compute |
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221 | * the denominator and numerator. based on fomula: |
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222 | * log(x, base) = log10(x) / log10(base). |
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223 | */ |
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224 | static tp_obj math_log(TP) { |
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225 | double x = TP_NUM(); |
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226 | tp_obj b = TP_DEFAULT(tp_None); |
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227 | double y = 0.0; |
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228 | double den = 0.0; /* denominator */ |
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229 | double num = 0.0; /* numinator */ |
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230 | double r = 0.0; /* result */ |
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231 | |||
232 | if (b.type == TP_NONE) |
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233 | y = M_E; |
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234 | else if (b.type == TP_NUMBER) |
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235 | y = (double)b.number.val; |
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236 | else |
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237 | tp_raise(tp_None, "%s(x, [base]): base invalid", __func__); |
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238 | |||
239 | errno = 0; |
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240 | num = log10(x); |
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241 | if (errno == EDOM || errno == ERANGE) |
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242 | goto excep; |
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243 | |||
244 | errno = 0; |
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245 | den = log10(y); |
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246 | if (errno == EDOM || errno == ERANGE) |
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247 | goto excep; |
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248 | |||
249 | r = num / den; |
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250 | |||
251 | return (tp_number(r)); |
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252 | |||
253 | excep: |
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254 | tp_raise(tp_None, "%s(x, y): x=%f,y=%f " |
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255 | "out of range", __func__, x, y); |
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256 | } |
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257 | |||
258 | /* |
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259 | * log10(x) |
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260 | * |
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261 | * return 10-based logarithm of x. |
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262 | */ |
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263 | TP_MATH_FUNC1(log10) |
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264 | |||
265 | /* |
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266 | * modf(x) |
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267 | * |
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268 | * return a pair (r, y). r is the integral part of |
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269 | * x and y is the fractional part of x, both holds |
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270 | * the same sign as x. |
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271 | */ |
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272 | static tp_obj math_modf(TP) { |
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273 | double x = TP_NUM(); |
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274 | double y = 0.0; |
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275 | double r = 0.0; |
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276 | tp_obj rList = tp_list(tp); |
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277 | |||
278 | errno = 0; |
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279 | r = modf(x, &y); |
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280 | if (errno == EDOM || errno == ERANGE) { |
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281 | tp_raise(tp_None, "%s(x): x=%f, " |
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282 | "out of range", __func__, x); |
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283 | } |
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284 | |||
285 | _tp_list_append(tp, rList.list.val, tp_number(r)); |
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286 | _tp_list_append(tp, rList.list.val, tp_number(y)); |
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287 | return (rList); |
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288 | } |
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289 | |||
290 | /* |
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291 | * pow(x, y) |
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292 | * |
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293 | * return value of x raised to y. equivalence of x ** y. |
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294 | * NOTE: conventionally, tp_pow() is the implementation |
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295 | * of builtin function pow(); whilst, math_pow() is an |
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296 | * alternative in math module. |
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297 | */ |
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298 | static tp_obj math_pow(TP) { |
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299 | double x = TP_NUM(); |
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300 | double y = TP_NUM(); |
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301 | double r = 0.0; |
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302 | |||
303 | errno = 0; |
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304 | r = pow(x, y); |
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305 | if (errno == EDOM || errno == ERANGE) { |
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306 | tp_raise(tp_None, "%s(x, y): x=%f,y=%f " |
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307 | "out of range", __func__, x, y); |
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308 | } |
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309 | |||
310 | return (tp_number(r)); |
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311 | } |
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312 | |||
313 | |||
314 | /* |
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315 | * radians(x) |
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316 | * |
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317 | * converts angle x from degrees to radians. |
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318 | * NOTE: this function is introduced by python, |
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319 | * adopt same solution as degrees(x). |
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320 | */ |
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321 | static double radians(double x) |
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322 | { |
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323 | return (x * degToRad); |
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324 | } |
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325 | |||
326 | TP_MATH_FUNC1(radians) |
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327 | |||
328 | /* |
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329 | * sin(x) |
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330 | * |
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331 | * return sine of x, x is measured in radians. |
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332 | */ |
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333 | TP_MATH_FUNC1(sin) |
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334 | |||
335 | /* |
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336 | * sinh(x) |
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337 | * |
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338 | * return hyperbolic sine of x. |
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339 | * mathematically, sinh(x) = (exp(x) - exp(-x)) / 2. |
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340 | */ |
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341 | TP_MATH_FUNC1(sinh) |
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342 | |||
343 | /* |
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344 | * sqrt(x) |
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345 | * |
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346 | * return square root of x. |
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347 | * if x is negtive, raise out-of-range exception. |
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348 | */ |
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349 | TP_MATH_FUNC1(sqrt) |
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350 | |||
351 | /* |
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352 | * tan(x) |
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353 | * |
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354 | * return tangent of x, x is measured in radians. |
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355 | */ |
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356 | TP_MATH_FUNC1(tan) |
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357 | |||
358 | /* |
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359 | * tanh(x) |
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360 | * |
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361 | * return hyperbolic tangent of x. |
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362 | * mathematically, tanh(x) = sinh(x) / cosh(x). |
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363 | */ |
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364 | TP_MATH_FUNC1(tanh)>=>=> |
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365 |