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From: Eric on 27 Apr 2010 15:35
Hi everyone-

I am making an animation out of several .asc files that represent snowcover. In the plots/animation I would like to not have the the zero values (no snow cover) as no color. I have tried excludedata, but am getting no where.

I have tried replacing all 0.00 with NaN, but that does not seem to work.?.

h2 = subplot(212);
set(h2,'position',[0.13 0.11 0.775 0.6])
imagesc(swe,[0 4]) % this sets the range of snow depth from 0 to 4
colormap('winter')
colorbar('EastOutside')
axis('equal')

Thanks for your help-
Eric
From: sprolese on 29 Apr 2010 17:07
"Eric " <sprolese(a)lanecc.edu> wrote in message <hr7e9b$m0u$1(a)fred.mathworks.com>...
> Hi everyone-
>
> I am making an animation out of several .asc files that represent snowcover. In the plots/animation I would like to not have the the zero values (no snow cover) as no color. I have tried excludedata, but am getting no where.
>
> I have tried replacing all 0.00 with NaN, but that does not seem to work.?.
>
> h2 = subplot(212);
> set(h2,'position',[0.13 0.11 0.775 0.6])
> imagesc(swe,[0 4]) % this sets the range of snow depth from 0 to 4
> colormap('winter')
> colorbar('EastOutside')
> axis('equal')
>
> Thanks for your help-
> Eric

so I found the answer from this link:
http://clipmarks.com/clipmark/EA9157A0-E584-4044-BB44-0BC71013F1A9/

here is the way my file worked to get the .asc to create one frame with nan as no color

<<--Begin Code -->>
filename = ['swe_depth_2002.05.30.00.asc'];

swe_zero = textread(filename,'',-1,'headerlines',6);

swe_zero(swe_zero == 0)=nan;

z=swe_zero;
z(isnan(swe_zero))=0;
z(~isnan(swe_zero))=1;

colormap(mycmap);
imagesc(swe_zero);
colorbar;
set(gca,'color',[1 1 1]);
alpha(z);
axis image;

[iy,ix]=find(a==amax);
line(ix,iy,'marker','o',...
'markerfacecolor',[0 0 0],...
'markeredgecolor',[0 0 0]);

<<--End Code -->>
From: us on 29 Apr 2010 17:25
"Eric " <sprolese(a)lanecc.edu> wrote in message <hr7e9b$m0u$1(a)fred.mathworks.com>...
> Hi everyone-
>
> I am making an animation out of several .asc files that represent snowcover. In the plots/animation I would like to not have the the zero values (no snow cover) as no color. I have tried excludedata, but am getting no where.
>
> I have tried replacing all 0.00 with NaN, but that does not seem to work.?.
>
> h2 = subplot(212);
> set(h2,'position',[0.13 0.11 0.775 0.6])
> imagesc(swe,[0 4]) % this sets the range of snow depth from 0 to 4
> colormap('winter')
> colorbar('EastOutside')
> axis('equal')
>
> Thanks for your help-
> Eric

one of the many solutions

m=magic(16);
m(m<128)=nan;
imagesc(m);
axis image;
colormap(hot(129));
colorbar;
alpha(double((~isnan(m))));

us
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