Hi,
The bug that affected the dct transform in Scilab 5.4.0 is still present
in Scilab 5.5.0. To evidence the bug,
please run the following lines:
x = 0:127;
xx = 0:255;
y = cos(2*%pi*x/32).*exp(-x/32);
yy = cos(2*%pi*xx/64).*exp(-xx/64);
w = dct(y);
z = fft(y);
//ww = dct(yy,"dct1");
where I define a damped sinusoid and attempt to compute an fft *AND* a
dct from it.
The output is:
Warning !!!
Scilab has found a critical error (EXCEPTION_ACCESS_VIOLATION)
with "fftw" function.
Save your data and restart Scilab.
On the other hand, if I compute 'ww' instead of 'w', i.e. dct and fft on
vectors of different lengths,
the problem disappears.
It would seem that one of the numerous fftw parameters is not reset
between two calls.
JP Grivet
_______________________________________________
users mailing list
[email protected]
http://lists.scilab.org/mailman/listinfo/users
