fftw - Problem with FFTW2 routine in C -

-

i'm working fftw2 (fastest fourier transform in west) library, , after writing successful routine in fortran, moving on c. however, i'm having trouble data assigning when try input data transform (ie, values of sin(x)). currently, code is:

#include <stdio.h> #include <fftw.h> #include <math.h> #include <complex.h>  void compute_fft(){   int i;   const int n[8];   fftw_complex in[8];   fftwnd_plan p;    in[0]->re = 0;   in[1]->re = (sqrt(2)/2);   in[2]->re = 1;   in[3]->re = (sqrt(2)/2);   in[4]->re = 0;   in[5]->re = -(sqrt(2)/2);   in[6]->re = -1;   in[7]->re = -(sqrt(2)/2);    for(i = 0; < 8; i++){     (in[i])->im = 0;   }    p = fftwnd_create_plan(8, n, fftw_forward, fftw_esimate | fftw_in_place);   fftwnd_one(p, &in[0], null);   fftwnd_destroy_plan(p);    printf("sin\n");   for(i = 0; < 8; i++){     printf("%d\n", n[i]);   } }

i've been using http://fftw.org/fftw2_doc/ link documentation/tutorial purposes, , error "invalid type argument of a->a (have afftw_complexa)", , 'a' characters on either side of -> , fftw_complex have carats above them. i'm using same pattern worked when wrote in fortran, , seem following tutorial, it's assignment here messing syntax on. record, compiler using nvcc, if makes difference (i tried gcc). if here has every used fftw2 in c before, correct mistake? thank you!

it might because of array "in" array of fftw_complex instead of using in[0]->re = 0 should use in[0].re = 0. unless fftw_complex again typedefined array.

fftw_complex in[8]; in[0].re = 0; in[1].re = (sqrt(2)/2); in[2].re = 1; in[3].re = (sqrt(2)/2); in[4].re = 0; in[5].re = -(sqrt(2)/2); in[6].re = -1; in[7].re = -(sqrt(2)/2);

Comments

Post a Comment

Popular posts from this blog

Cursor error with postgresql, pgpool and php -

-
hey, struggling bit determine exact cause of error has been popping in our release environment. there not seem dealing particular error on google. this error message getting: sqlstate[34000]: invalid cursor name: 7 error: portal "" not exist the error pops when using pdo prepared statements. this setup our release environment: pgpool 3.0.1 (the postgresql backend in streaming replication mode!) php 5.3.5 postgresql 9.0 edit: architecture 64bit. the same error not manifest in our test environment (edit: forgot mention, standard test environment uses postgresql 9.0 without pgpool). thus, led suspect pgpool @ least partly suspect. does know probable causes error are? edit: ok, here example of kind of code causes error. $sql = 'select * '; $sql .= 'from "mytable" "mystuff" '; $sql .= 'where "mytable"."status" = 1 '; $sql .= 'and "mytable"."mytableid" = :table...
Read more

delphi - ESC/P programming! -

-
why need use because printers using tprinter prints weird hieroglyph @ beginning of printable area. my problem if send commands, nothing happens. esc e (#27 #69) - sending escape sequence didn't work expected. removed first letter , rest of string made bold. eg. hello -> ello . after changed esc e esc (#27 #69 #27), worked fine. example managed figure out, but... trying select character table "esc t n" (#27 #116 n), make "õäöü" work. command doesn't work. nothing happens! , command supported esc/p, esc/p 2 , 9-pin esc/p, should work fine. manual can found here . if has ever needed use esc/p commands maybe 1 can shed light how work them! thanks in advance! edit: in previous post asked more or less same question though answers how did send commands printer. (i'll change question there according answers!) i accepted ken's answer, because claimed way transferred commands wasn't best , got work escape command. problem after t...
Read more

c++ - error: use of deleted function -

-
i've been working on c++ code friend has written , following error have never seen before when compiling gcc4.6: error: use of deleted function ‘gamefsm_<std::array<c, 2ul> >::hdealt::hdealt()’ implicitly deleted because default definition ill-formed: uninitialized non-static const member ‘const h_t floppokergamefsm_<std::array<c, 2ul> >::hdealt::h’ edit: comes part of code using boost msm: boost webpage edit2: there no = delete() used anywhere in sourcecode. generally speaking, error mean? should looking when type of error occurs? i don't think other answers mentioning =deleted; syntax correct. error message says default constructor has been deleted implicitly . says why: class contains non-static, const variable, not initialized default ctor. class x { const int x; }; since x::x const , must initialized -- default ctor wouldn't initialize (because it's pod type). therefore, default ctor, need define 1 (and must ...
Read more