Asked by hans
on 1 Apr 2011

If I use

set(gca,'xtick',[])

the ticks vanish as expected, but the exponent, common for all ticks, remains in the plot at the end of the axis.

How can I avoid this

Answer by Friedrich
on 1 Apr 2011

Accepted Answer

Hi Hans,

now I get it. In this special case you have to deactivate the xticklabels, too. This should works fine:

A(1,1:21)= 100000:100020;

B(1:100,1)= 1:100;

C(1:100,1:21)=33;

figure;

pcolor(A,B,C)

set(gca,'xtick',[])

set(gca,'xticklabel',[])

Best regards,

Friedrich

Answer by Friedrich
on 1 Apr 2011

Hi Hans,

could you please post a working code? Because I am not able to reproduce your problem. Under Win7 64bit and R2009a the following code work fine:

>>n = 6;

>>r = (0:n)'/n;

>>theta = pi*(-n:n)/n;

>>X = r*cos(theta);

>>Y = r*sin(theta);

>>C = r*cos(2*theta);

>> pcolor(X*1e-4,Y*1e-4,C)

>> set(gca,'XTick',[])

So it must be related to your code.

Friedrich

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Answer by Jan
on 1 Apr 2011

A workaround:

A(1,1:21)= 100000:100020;

B(1:100,1)= 1:100;

C(1:100,1:21)=33;

figure;

ax = axes('XTick', [], 'nextplot', 'add');

pcolor(ax, A,B,C)

set(ax, 'YLim', [min(B), max(B)]);

Answer by David
on 19 Aug 2011

I found this elsewhere.

1 vote Kelly Kearney answered 17 days ago Change the renderer from OpenGL to zbuffer.

set(gcf, 'renderer', 'zbuffer');Why this fixes the problem, I really have no idea. But I encounter it a lot when I add dateticks to my axes. Not sure if it's intended behavior or a bug, but most renderers eliminate the factor when manual tick labels are added; OpenGL does not (or at least doesn't always).

Aurelien Queffurust
on 5 Mar 2014

I confirm this solution allows to removes exponent on my Windows 64-bit

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Answer by Greg
on 18 Nov 2015

I realize this is a pretty old thread, but I think I've figured out what might have been causing a lot of the confusion in there after running into this issue myself...

Basically, the "opengl" renderer in older versions of MATLAB seems to have a bug that, when a custom XTickLabel is set, the axis exponent is still displayed. This does bug does not appear to happen with the "zbuffer" or "painters" Renderers.

The size of the "B" matrix matters because when you add a very large graphics object to a plot, MATLAB automatically switches the renderer over to opengl (presumably because of the better performance vs. painters or zbuffer).

So, when you execute this code in R2011b, you get no exponent on the axis:

figure

plot(1e6*(1:10),rand(10))

set(gca,'XTickLabel',{'a','b'})

But then if you flip the renderer to opengl, the exponent will appear:

set(gcf,'Renderer','opengl')

You can get rid of it again by going back to painters or zbuffer:

set(gcf,'Renderer','zbuffer')

set(gcf,'Renderer','painters')

I've tested this in R2011b (where the described issue exists) and in R2015a (where it does not), both on 64-bit Windows.

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Answer by the cyclist
on 1 Apr 2011

Can you give a simple example of code that exhibits this problem, because I am not seeing that behavior. For example, does this code

figure

plot(10.^(1:10),1:10)

set(gca,'XTick',[])

leave the exponent remaining? It does not for me.

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Answer by hans
on 1 Apr 2011

A very simple code with data generating my problem is:

clear

A(1,1:21)= 100000:100020;

B(1:100,1)= 1:100;

C(1:100,1:21)=33;

figure;

pcolor(A,B,C)

set(gca,'xtick',[])

a simple code that does not generate the problem is just a slightly smaller matrix

clear

A(1,1:21)= 100000:100020;

B(1:10,1)= 1:10;

C(1:10,1:21)=33;

figure;

pcolor(A,B,C)

set(gca,'xtick',[])

hans
on 1 Apr 2011

I have modified this answer slightly in the way I included a code that worked fine and one not working fine for comparison.

Just the size of matrix seems to make a difference.

Jan
on 1 Apr 2011

Bug confirmed for Matlab 2009a32 on WinXP32. Please send a bug report to MathWorks.

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Answer by hans
on 1 Apr 2011

Yes, You are right, that works ! Thank You.

However I'm still confused:

1: That I do not have to remove the xticklabel, if I use a matrix for B with a slightly smaller number of elements.

2: That the extracted exponential part of the ticks is not part of the tick but is a ticklabel

Do You have an explanation which could help me to understand ?

hans
on 1 Apr 2011

OK, thank You for the explanation of question 2.

Do You also have an idea regarding question 1 ?

Jan
on 1 Apr 2011

hans
on 1 Apr 2011

That suggests a quick and dirty programming of the Matlab people has remained in the code ...

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Answer by hans
on 1 Apr 2011

OK, thank You Friedrich and Jan Both Your suggestions work.

To summarize the explanation of Jan why the problem occurs: The exponent object is attached to the XTickLabels.

What I still do not understand is:

Why does the size of the matrix B make a difference, if the leaving behind of the exponent occurs or not.

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Answer by hans
on 1 Apr 2011

a continuation of this problem occurs if I apply the command

datetick

This changes the number-labels into dates but leaves behind the 10^5 from the original numbers at the axis.

Any suggestions how to deal with this other than rewriting the datetick.m ?

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