kopia lustrzana https://github.com/Dsplib/libdspl-2.0
42 wiersze
1.2 KiB
C
42 wiersze
1.2 KiB
C
#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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#define N 250
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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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double x[N], y[N];
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int ord;
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char fn[64];
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hdspl = dspl_load(); /* Load DSPL function */
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linspace(-1.0, 1.0, N, DSPL_SYMMETRIC, x);
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for(ord = 1; ord < 5; ord++)
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{
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cheby_poly2(x, N, ord, y);
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sprintf(fn, "dat/cheby_poly2_ord%d.txt", ord);
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writetxt(x,y,N,fn);
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}
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/* plotting by GNUPLOT */
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gnuplot_create(argc, argv, 560, 380, "img/cheby_poly2.png", &hplot);
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gnuplot_cmd(hplot, "set grid");
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gnuplot_cmd(hplot, "set key left top");
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gnuplot_cmd(hplot, "set xlabel 'x'");
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gnuplot_cmd(hplot, "set ylabel 'U_N (x)'");
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gnuplot_cmd(hplot, "set yrange [-3.5:3.5]");
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gnuplot_cmd(hplot, "plot 'dat/cheby_poly2_ord1.txt' with lines, \\");
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gnuplot_cmd(hplot, " 'dat/cheby_poly2_ord2.txt' with lines, \\");
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gnuplot_cmd(hplot, " 'dat/cheby_poly2_ord3.txt' with lines, \\");
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gnuplot_cmd(hplot, " 'dat/cheby_poly2_ord4.txt' with lines");
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gnuplot_close(hplot);
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dspl_free(hdspl); /* free dspl handle */
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return 0;
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} |