MATLAB Central Newsreader - help to save file from histogram

help to save file from histogram

uny gg — Wed, 04 Nov 2009 04:06:02 -0500

Hello all

I am trying to save the histogram image as a file.. (any format e.g. png, jpeg. etc)
The problem is that I have to do this continuous many times..

Here is may code.

function dim = PatchDistHistogram(data)
    dim = size(data);
    nFeature = dim(2);

    for i=1:nFeature
      hist(data(:,i));
      fname = ['astro' int2str(i) '.png'];
      fname
      print fname -dpng
    end

end

When I run this code, it shows that each histogram in screen, however,
There is no file which is created from this.

I am not sure.. what is problem.

Could you please somebody help me with this?

Re: help to save file from histogram

the cyclist — Wed, 04 Nov 2009 04:46:00 -0500

"uny gg" <illinois.ks@gmail.com> wrote in message <hcquja$ht8$1@fred.mathworks.com>...
> Hello all
>
> I am trying to save the histogram image as a file.. (any format e.g. png, jpeg. etc)
> The problem is that I have to do this continuous many times..
>
> Here is may code.
>
> function dim = PatchDistHistogram(data)
> dim = size(data);
> nFeature = dim(2);
>
> for i=1:nFeature
> hist(data(:,i));
> fname = ['astro' int2str(i) '.png'];
> fname
> print fname -dpng
> end
>
> end
>
>
> When I run this code, it shows that each histogram in screen, however,
> There is no file which is created from this.
>
> I am not sure.. what is problem.
>
> Could you please somebody help me with this?

Use the functional form of print when you have a string with the filename. I think the syntax, the way you have created "fname", should be

>> print('-dpng',fname)

If that does not work, look at "help print" for the functional method syntax.

Re: help to save file from histogram

uny gg — Wed, 04 Nov 2009 05:01:35 -0500

Hello cyclist

Thank you for your response.
I also tried with that.. It doesn't work for me.
I looked at the "print" help manual. However, I could not figure out the way .. T.T

Any ideas?

Re: help to save file from histogram

ImageAnalyst — Wed, 04 Nov 2009 11:41:32 -0500

I use Oliver Woodford's "export_fig" -- it's in the FileExchange.
People always have trouble trying to figure out saving figures
properly using the built in MATLAB routines. export_fig() does what
you want and expect and it's easy to use. It uses the built in
routines too but it knows how to set and use them properly, relieving
you of that pain.