Re: Function that calls plot

Andnan wrote:
> I'm trying to make a FFT plotting function that's a little better then
> gplot(abs(fft));
> 
> I want the frequency axis centered at 0 and I want the frequency axis
> normalized.
> 
> My probelm is that I want to pass the name of the file to save to plot to as
> a parameter and I can't get it working.  Here's my code.
> 
> function OctaveFFTPlot(x,file_name)
> 	clf;
> 	grid on;		#turn on the grid
> 	
> 	# Amplitude plot
> 	yLabel('Amplitude');		#Set the y axis	
> 	
> 	fft_data = fft(x);			#do an FFT on the sample data
> 	
> 	fftshift(fft_data);
> 	
> 	# create a normaized frequency axis for the plot
> 	normal_f=(1:length(fft_data))./ length(fft_data);
> 	normal_f = normal_f.-0.5;
> 	
> 	plot(normal_f,abs(fft_data));
> 	gset out file_name;
> 	gset terminal gif;
> 	replot;	
> 	closeplot;
> end;
> 
> It is not saving the file to the file_name.
> 
> any Ideas?

Andnan,

You are working with a fairly old version of octave.  "gset" has been moved to "__gnuplot_raw__()".  In any case, perhaps you need some quotations around the file name.  The equivalent gnuplot command is:

set output 'filename.gif'

and you may be sending it a command like

set output filename.gif

which would error in gnuplot.  Something like

eval(["set out '" file_name "'"]);

or some variation thereof might do thet trick.

Also, try to put the "set out" after the "set term".  I don't think order matters in gnuplot anymore, but it once did.

Dan