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Справка Scilab >> API Scilab > API polynomial functions

API polynomial functions

This page lists all the functions to manipulate Scilab native objects containing polynomials

scilabVar scilab_createPolyMatrix( scilabEnv env, const wchar_t* varname, int dim, const int* dims, int complex)

Create a polynomial matrix in varname with dim dimensions (dims[0], dims[1], ..., dims[dim-1]).

complex: 0 to real matrix or 1 to complex matrix

scilabVar scilab_createPolyMatrix2d( scilabEnv env, const wchar_t* varname, int row, int col, int complex)

Create a matrix of polynomial in varname with 2 dimensions M(row, col).

complex: 0 to real matrix or 1 to complex matrix

scilabVar scilab_createPoly( scilabEnv env, const wchar_t* varname, int val, int complex)

Create a scalar polynomial in varname.

complex: 0 to real matrix or 1 to complex matrix

int scilab_getPolyVarname( scilabEnv env, scilabVar var, const wchar_t** varname)

Fill varname with polynomial symbol.

scilabStatus scilab_getPolyArray( scilabEnv env, scilabVar var, int index, double** real)

Get pointer on internal array of polynomial of var at position index.

scilabStatus scilab_getComplexPolyArray( scilabEnv env, scilabVar var, int index, double** real, double** img)

Get pointers on internal array of polynomial of var at position index.

scilabStatus scilab_setPolyArray( scilabEnv env, scilabVar var, int index, int rank, const double* real)

Set values of polynomial variable var at position index.

scilabStatus scilab_setComplexPolyArray( scilabEnv env, scilabVar var, int index, int rank, const double* real, const double* img)

Set values of complex polynomial variable var at position index.

Examples

#include "api_scilab.h"
#include "Scierror.h"
#include "localization.h"
#include "sciprint.h"
#include "sci_malloc.h"

const char fname[] = "polynomial_test";

int sci_polynomial_test(scilabEnv env, int nin, scilabVar* in, int nopt, scilabOpt opt, int nout, scilabVar* out)
{
    int i = 0;
    int inr1 = 0;
    int inc1 = 0;
    int size1 = 0;
    double* in1 = NULL;
    int rank1 = 0;
    wchar_t* name1 = NULL;

    double* in2 = 0;
    int rank2 = 0;
    wchar_t* name2 = NULL;

    double* out1 = NULL;

    double* out2 = 0;

    if (nin != 2)
    {
        Scierror(999, _("%s: Wrong number of input arguments: %d expected.\n"), fname, 2);
        return STATUS_ERROR;
    }

    if (nout != 2)
    {
        Scierror(999, _("%s: Wrong number of output arguments: %d expected.\n"), fname, 2);
        return STATUS_ERROR;
    }

    //in[0] : matrix 2d of polynomial
    if (scilab_isPoly(env, in[0]) == 0 || scilab_isMatrix(env, in[0]) == 0)
    {
        Scierror(999, _("%s: Wrong type for input argument #%d: A polynomial matrix expected.\n"), fname, 1);
        return STATUS_ERROR;
    }

    //scilab_getPolyVarname(env, in[0], &name1);
    size1 = scilab_getDim2d(env, in[0], &inr1, &inc1);

    //in[1] : polynomial
    if (scilab_isPoly(env, in[1]) == 0 || scilab_isScalar(env, in[1]) == 0)
    {
        Scierror(999, _("%s: Wrong type for input argument #%d: A polynomial expected.\n"), fname, 2);
        return STATUS_ERROR;
    }

    //scilab_getPolyVarname(env, in[1], &name2);
    rank2 = scilab_getPolyArray(env, in[1], 0, &in2);

    //out1 : matrix 2d of polynomial with same size of in[0]
    out[0] = scilab_createPolyMatrix2d(env, L"s", inr1, inc1, 0);

    for (i = 0; i < size1; ++i)
    {
        int j = 0;
        rank1 = scilab_getPolyArray(env, in[0], i, &in1);
        out1 = (double*)MALLOC((rank1 + 2) * sizeof(double));//+1 to grow and +1 because rank is (size - 1)
        out1[0] = 0;

        for (j = 0; j < rank1 + 1; ++j)
        {
            out1[j + 1] = in1[j];
        }

        scilab_setPolyArray(env, out[0], i, rank1 + 1, out1);
        FREE(out1);
    }

    //out2 : polynomial -in2
    out[1] = scilab_createPoly(env, L"s", 0);
    out2 = (double*)MALLOC((rank2 + 1) * sizeof(double));
    for (i = 0; i < rank2 + 1; ++i)
    {
        out2[i] = -in2[i];
    }

    scilab_setPolyArray(env, out[1], 0, rank2, out2);
    FREE(out2);
    return STATUS_OK;
}

Scilab test script

mkdir(pathconvert(TMPDIR+"/api_c/"));
cd(pathconvert(TMPDIR+"/api_c/"));
copyfile(SCI+"/modules/api_scilab/tests/unit_tests/api_c/polynomial_test.c",pathconvert(TMPDIR+"/api_c/polynomial_test.c",%F));

ilib_build("libpolynomial",["polynomial_test","sci_polynomial_test", "csci6"],"polynomial_test.c",[],"","","");
exec("loader.sce");

in1 = [10, 4*%s + 8, -5 + 6*%s - 7*%s**2;10, 4*%s + 8, -5 + 6*%s - 7*%s**2],
in2 = 1-%s**2;

[out1, out2] = polynomial_test(in1, in2);
assert_checkequal(out1, in1 *%s);
assert_checkequal(out2, -in2);
disp("OK");
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Last updated:
Tue Feb 14 15:13:38 CET 2017