Re: print resolution in latex

[Ben Abbott]

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On Jan 16, 2012, at 10:46 AM, Reza Housseini wrote:

> On Mon, Jan 16, 2012 at 2:40 PM, Ben Abbott <address@hidden> wrote:
> 
>> On Jan 16, 2012, at 4:20 AM, Reza Housseini wrote:
>> 
>> > Hello Octave user,
>> >
>> > I try to print area plots with up to 35040 data points for the epslatex 
>> > device. But the generated .ps file in latex is huge (7.5MB), due to the 
>> > octave print output. I tried to adjust the resolution with the -r option 
>> > but this didn't work. Is there any other way to reduce the file size 
>> > without manually reduce my input vector? There's no need that I see all 
>> > the details over the 35040 points, is just to get the reader an impression 
>> > of how the data looks like.
>> >
>> > Thanks a lot for the support,
>> >
>> > Best wishes,
>> > Reza
>> 
>> Did you use the scattter() command to produce your plot ?  This command 
>> produces a patch object for each data point and can produce a very large 
>> file (and slow plot updates).
>> 
>> If you used that, you can try the plot command instead. Depending upon what 
>> you want that may take some extra effort, but you can start with ...
>> 
>>        x = randn (1, 35040);
>>        y = randn (1, 35040);
>>        h = plot(x, y, "s");
>>        set (h, "markerfacecolor", "auto")
>> 
>> Gnuplot's markers are  not implemented in a consistent way. So it may no 
>> display as expected, but if you print it, you will get the expected result.
>> 
>>        print -depsc test.eps
>> 
>> Using my example, the file size is 549 kB.
>> 
>> If my guess that you're using scatter() is not correct, please give us more 
>> information. If possible a simple script that demonstrates the problem would 
>> be helpful.
>> 
>> Ben
> 
> Hello Ben, 
> Thank you for the answer. I used the area plot function, here a small example:
> 
> Y = randn (4, 35040);
> 
> area(Y)
> set(gca,"Layer","top")
> grid on
> 
> print("test.tex","-dtex","-S1000,400");
> 
> So I want to stack the different vectors on each other and color the areas in 
> between. With this approach however the files are large. Up to 5MB.
> I just wondered if there is an technique to reduce the generated data, 
> because in this way there's no use for a report due to much too large file 
> sizes. 
> 
> Reza

If a bitmap is acceptable, Jaun's advice is a quick and easy solution.

If it isn't acceptable, you can try to prune the area curve. The area curve is 
actually a patch object.

        N = 100;
        figure (1)
        clf
        h = area (rand (1, N));
        hp = findobj (h, "type", "patch");
        xdata = get (hp, "xdata");
        ydata = get (hp, "ydata");
        cdata = get (hp, "cdata");
        n = union (1:10:numel(xdata),[1:2, N+(1:2), 2*N+(0:1)]);
        figure (2)
        clf
        patch (xdata(n), ydata(n), cdata)
        
This doesn't work so well for random data, but does it do what you want ?

Ben