kopia lustrzana https://github.com/Dsplib/libdspl-2.0
added example for butter_zp
rodzic
74a71b63de
commit
2962244fcc
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@ -222,6 +222,34 @@ int DSPL_API writetxt(double* x, double* y, int n, char* fn)
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}
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/******************************************************************************
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Write a real arrays to the text file "fn"
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*******************************************************************************/
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int DSPL_API writetxt_cmplx(complex_t* x, int n, char* fn)
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{
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int k;
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FILE* pFile = NULL;
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if(!x)
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return ERROR_PTR;
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if(n < 1)
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return ERROR_SIZE;
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if(!fn)
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return ERROR_FNAME;
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pFile = fopen(fn, "w+");
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if(pFile == NULL)
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return ERROR_FOPEN;
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for(k = 0; k < n; k++)
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fprintf(pFile, "%+.12E %+.12E\n", RE(x[k]), IM(x[k]));
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fclose(pFile);
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return RES_OK;
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}
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/******************************************************************************
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Write a int arrays to the text file "fn"
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*******************************************************************************/
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@ -0,0 +1,55 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "dspl.h"
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/* Filter order */
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#define ORD 7
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int main(int argc, char* argv[])
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{
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void* hdspl; /* DSPL handle */
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void* hplot; /* GNUPLOT handle */
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/* Load DSPL functions */
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hdspl = dspl_load();
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complex_t z[ORD+1]; /* H(s) zeros vector */
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complex_t p[ORD+1]; /* H(s) poles vector */
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double Rp = 1.0; /* Magnitude ripple from 0 to 1 rad/s */
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int res, k, nz, np;
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/* Zeros and poles vectors calculation */
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res = butter_ap_zp(ORD, Rp, z, &nz, p, &np);
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if(res != RES_OK)
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printf("error code = 0x%8x\n", res);
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printf("Butterworth filter zeros: %d\n", nz);
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printf("Butterworth filter poles: %d\n", np);
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/* Print H(s) coefficients */
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for(k = 0; k < np; k++)
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printf("p[%2d] = %9.3f %+9.3f j\n", k, RE(p[k]), IM(p[k]));
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/* Write complex poles to the file */
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writetxt_cmplx(p, ORD, "dat/butter_ap_zp.txt");
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/* plotting by GNUPLOT */
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gnuplot_create(argc, argv, 440, 360, "img/butter_ap_zp_test.png", &hplot);
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gnuplot_cmd(hplot, "unset key");
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gnuplot_cmd(hplot, "set grid");
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gnuplot_cmd(hplot, "set xlabel 'sigma'");
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gnuplot_cmd(hplot, "set ylabel 'jw'");
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gnuplot_cmd(hplot, "set size square");
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gnuplot_cmd(hplot, "set xrange [-1.5:1.5]");
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gnuplot_cmd(hplot, "set yrange [-1.5:1.5]");
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gnuplot_cmd(hplot, "plot 'dat/butter_ap_zp.txt' with points pt 2");
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gnuplot_close(hplot);
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/* free dspl handle */
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dspl_free(hdspl);
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return res;
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}
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@ -177,6 +177,7 @@ p_writebin writebin ;
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p_writetxt writetxt ;
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p_writetxt_3d writetxt_3d ;
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p_writetxt_3dline writetxt_3dline ;
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p_writetxt_cmplx writetxt_cmplx ;
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p_writetxt_cmplx_im writetxt_cmplx_im ;
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p_writetxt_cmplx_re writetxt_cmplx_re ;
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p_writetxt_int writetxt_int ;
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@ -379,6 +380,7 @@ void* dspl_load()
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LOAD_FUNC(writetxt);
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LOAD_FUNC(writetxt_3d);
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LOAD_FUNC(writetxt_3dline);
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LOAD_FUNC(writetxt_cmplx);
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LOAD_FUNC(writetxt_cmplx_im);
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LOAD_FUNC(writetxt_cmplx_re);
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LOAD_FUNC(writetxt_int);
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@ -960,6 +960,10 @@ DECLARE_FUNC(int, writetxt_3dline, double* x
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COMMA int n
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COMMA char* fn);
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/*----------------------------------------------------------------------------*/
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DECLARE_FUNC(int, writetxt_cmplx, complex_t* x
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COMMA int n
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COMMA char* fn);
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/*----------------------------------------------------------------------------*/
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DECLARE_FUNC(int, writetxt_cmplx_im, double*
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COMMA complex_t*
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COMMA int
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