Hi all,

I am working with complex number and using fftw library ( FFTW Home Page ) to compute fft of some data. But when I am compiling my following simple piece of code , I am getting the above mentioned error.

fftw_malloc behaves like malloc except that it properly aligns the array when SIMD instructions (such as SSE and Altivec) are available. The data is an array of type fftw_complex, which is by default a double[2] composed of the real (in[i][0]) and imaginary (in[i][1]) parts of a complex number.Code:#define re(c) ((c)[0]) ///< real part of a complex number as defined by fftw_complex in fftw #define im(c) ((c)[1]) #include <fftw3.h> #include <stdio.h> #include <stdlib.h> #include <string.h> unsigned int fs = 16367600; double fif = 4.1304E6; double range = fif; double span = 10E3; double fd_step = 500; double Tint = 1; unsigned int l,C1,D1; int main() { C1 = ceil((double) fs * 1E-3); D1 = ceil(span / fd_step) + 1; SUM_SS = (fftw_complex *) fftw_malloc(sizeof(fftw_complex) * C1 * D1); if (SUM_SS == NULL) { fprintf(stderr, "Error allocationg memory fftw operations \n"); } for (l = 0; l < C1 *D1; l++) { re(SUM_SS[l]) = 0.0; im(SUM_SS[l]) = 0.0; } }

The error is reported on line re(SUM_SS[l]) = 0.0; and im(SUM_SS[l]) = 0.0; and reported error is

error: lvalue required as left operand of assignment

Please help me

Thanks