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Lib/signal/bspline_util.c

 

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#include <math.h>

 

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#include <stddef.h>

 

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#include <stdlib.h>

 

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#include <string.h>

 

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#include <stdio.h>

 

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void compute_root_from_lambda(double, double *, double *);

 

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void

 

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compute_root_from_lambda(lambda, r, omega)

 

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     double lambda;

 

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     double *r;

 

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     double *omega;

 

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{

 

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    double xi;

 

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    double tmp, tmp2;

 

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    tmp = sqrt(3 + 144*lambda);

 

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    xi = 1 - 96*lambda + 24*lambda * tmp;

 

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    *omega = atan(sqrt((144*lambda - 1.0)/xi));

 

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    tmp2 = sqrt(xi);

 

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    *r = (24*lambda - 1 - tmp2)/(24*lambda) \

 

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        * sqrt((48*lambda + 24*lambda*tmp))/tmp2;

 

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    return;

 

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}

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