21 lines
319 B
C
21 lines
319 B
C
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float bessy(int n, float x)
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{
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float bessy0(float x);
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float bessy1(float x);
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void nrerror(char error_text[]);
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int j;
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float by,bym,byp,tox;
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if (n < 2) nrerror("Index n less than 2 in bessy");
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tox=2.0/x;
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by=bessy1(x);
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bym=bessy0(x);
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for (j=1;j<n;j++) {
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byp=j*tox*by-bym;
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bym=by;
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by=byp;
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}
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return by;
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}
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