MATLAB Answers


flipud will not work anymore

Asked by Vince Clementi on 18 Sep 2017
Latest activity Commented on by Steven Lord
on 26 Sep 2017

Hi all,

I am creating a global map and using the cmocean colorbar options. I need to show depth below sea level, so for a few of the color options, I need to invert the colorbar direction. I did this a few months ago using the 'flipud' function and it worked flawlessly. However, I am trying to do the same thing again and it will not work. Am I missing something (code below)? Thanks!

[Z, refvec] = etopo('etopo1_ice_c_i2.bin', samplefactor);
geoshow(Z, refvec, 'DisplayType', 'surface');
cmap = cmocean(flipud('deep'),'5');
demcmap(Z, 256, cmap, [.25 .25 .25]);
c = colorbar
set(c, 'ylim', [-10000 0]);


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3 Answers

Answer by Chad Greene
on 26 Sep 2017
 Accepted Answer

The simplest solution is to use the - sign when calling cmocean. So instead of

cmap = cmocean('deep','5'); 


cmap = cmocean('-deep','5'); 


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Answer by Henry Giddens on 18 Sep 2017

It looks like you are calling flipud on the string 'deep', which will return the string 'deep'. I dont know what you cmocean command does (I am guessing it returns a colormap with 5 rows), but it looks like you may want to change this line to:

cmap = flipud(cmocean('deep','5'));


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Answer by Walter Roberson
on 18 Sep 2017

flipud('deep') means the same as flipud(['d', 'e', 'e', 'p']) which is asking to flip a 1 x 4 char array upside down, which would get you the same array ['d', 'e', 'e', 'p']


So ... you wouldn't get 'peed'?

Of course not.

Now if you had called fliplr or flip instead ... :)

>> fliplr('deep')
ans =
>> flip('deep')
ans =

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