Re: Newbie question

[Henry F. Mollet]

Thanks, Joe
[~] -bash-2.05b 501$ locate image.m
/usr/local/share/octave/2.1.71/m/image/image.m

/usr/local/share/octave/2.1.71/site/m/octave-forge/MacOSX/image.m
[~] -bash-2.05b 502$

Now please tell me why my set up is using your /MacOSX/image.m that uses
bmpwrite(A, colors, bmp_name);
## Author: Tony Richardson <address@hidden>
## Created: July 1994
## Adapted-By: jwe
## Mac OS X adaptation by J. Koski 6/24/04

Rather than image/image.m which would require ImageMagick
## Author: Tony Richardson <address@hidden>
## Created: July 1994
## Adapted-By: jwe
with:
  ## ImageMagick:
  im_display = sprintf ("display -geometry %f%% \"%s\"", zoom*100,
ppm_name);

Also, am I correct that the same applies to X11/xterm with graphing in X
gnuplot window. I've tried and again the image, e.g. image(ones(100))
appeared in Preview.
Henry
 



on 8/4/05 4:19 PM, Joe Koski at address@hidden wrote:

> When a graphical output has a continuous range of color or gray scale, such
> as a photograph, octave doesn't currently have a way to pass scale
> information to gnuplot/aquaterm. As a workaround, Paul Kienzle's bmpwrite.m
> is used for image.m on a Mac. This allows the image to be written into the
> .bmp format, which is then automatically opened by the OS X in Preview.
> 
> The latest gnuplot 4.0/Aquaterm 1.0 combination now has color/gray scale
> capabilities. It's a matter of developing the necessary routines.
> 
> Joe
> 
> 
> on 8/4/05 4:57 PM, Henry F. Mollet at address@hidden wrote:
> 
>> I've recently pointed out a similar problem with respect to contourf(z) in
>> octave-forge. The output is sent to Preview and I don't understand why.
>> Henry
>> octave:62> gset term aqua 0
>> octave:63> [x,y] = meshgrid(linspace(-2,2,200));
>> octave:64> z = sinc(sqrt(x.^2 + y.^2));
>> octave:65> contourf(z);
>> error: expecting integer index, found 7.300000
>> error: evaluating argument list element number 1
>> error: called from `contourf' in file
>> `/usr/local/share/octave/2.1.71/site/m/octave-forge/plot/contourf.m'
>> 
>> octave:65> contourf(z); % works when used for the second time and output
>> appears in Preview rather than Aquaterm.
>> 
>> ## contourf(z,n,w)
>> ## Plots a filled contour plot of n levels using the current
>> ## colormap.  The width w is the width of the convolution window
>> ## which smooths the contours.
>> ##
>> ## E.g.,
>> ##     [x,y] = meshgrid(linspace(-2,2,200));
>> ##     z = sinc(sqrt(x.^2 + y.^2)) + 0.5*randn(size(x));
>> ##     contourf(z);
>> ##
>> ## Note that the algorithm computes incorrect contours near the
>> ## edges, which you can see using contourf(sinc(sqrt(x.^2+y.^2)))
>> ## with x,y from above.
>> 
>> ## This program is in the public domain
>> ## Author: Paul Kienzle <address@hidden>
>> 
>> function contourf(z,n,w)
>>   if nargin < 3, w = 16; end
>>   if nargin < 2, n = 10; end
>>   if nargin < 1 || nargin > 3
>>     usage("contourf(z [, n [, w]])");
>>   endif
>> 
>>   ## convolute the original with a gaussian if desired
>>   if w > 0
>>     [x,y] = meshgrid(2.5*linspace(-1,1,w));
>>     B = exp(-.5*(x.^2+y.^2));
>>     z = filter2(B,z,"same");
>>   endif
>> 
>>   ## find the contours
>>   C = colormap;
>>   colormap(repmat(linspace(0.5,1,n+1)',1,3));
>>   z = filter2(ones(2)/4,imagesc(z));
>>   z(z!=fix(z)) = 0;
>> 
>>   ## plot the image, with the contours drawn in black.
>>   colormap([0,0,0; C(linspace(1,rows(C),n+1),:)]);
>>   image(flipud(z)+1);
>> 
>>   ## restore the colormap
>>   colormap(C);
>> endfunction
>> 
>> 
>> on 8/4/05 2:17 PM, Melvyn Poore at address@hidden wrote:
>> 
>>> Hi folks, I¹m new on the block, so forgive me for asking beginner¹s
>>> questions.  I¹ve installed Octave 2.1.71, Gnuplot, Aqua and X11 on my Mac Ti
>>> Powerbook 550MHz, OSX 10.4.2.  It all appears to function as it should.
>>> That was already quite an achievement!
>>> 
>>> I¹m working on some sound analysis examples and want to put the waveform and
>>> spectrogram plots together in a two-plot diagram.  This doesn¹t seem to work
>>> because plot() sends its results out via Aqua whereas the output of
>>> imagesc() appears in a Mac Preview window.  Am I missing some terminal
>>> setting or something?  I¹ve already set the line
>>> 
>>> __gnuplot_set__ term aqua
>>> 
>>> in startup/octaverc.
>>> 
>>> Any help would be appreciated!
>>> 
>>> Melvyn
>> 
>> 
>> 
>> 
>> 
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> 
> 
> 
> 
> 
> -------------------------------------------------------------
> Octave is freely available under the terms of the GNU GPL.
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