Re: Non-linear axis data in imagesc

[Ben Abbott]

On Dec 2, 2011, at 8:20 AM, Daniel Arteaga wrote:

> On 02/12/11 14:15, Ben Abbott wrote:
>> On Dec 2, 2011, at 6:52 AM, Daniel Arteaga wrote:
>> 
>>> Hi all,
>>> 
>>> imagesc fails to display correctly non-linarly spaced axes. Instead it 
>>> "invents" linear axis from the maximum value. See what I mean:
>>> 
>>> x = logspace(0,5,20);
>>> y = logspace(0,2,10);
>>> A = rand(10,20);
>>> imagesc(x,y,A);
>>> 
>>> Is this a bug? Any workaround to get the correct behaviour?
>>> 
>>> Tested using GNU Octave Version 3.4.2 under Ubuntu 11.10.
>>> 
>>> Thank you,
>>> 
>>> Daniel
>> 
>> If you see (0,0) in the upper-left, then it is working as intended. Matlab 
>> behaves this way as well.
> 
> Sorry, I was not meaning that. What I was meaning is that the axis labels do 
> not correspond to the x vector defined above. The real axis should be 
> logarithmic, but imagesc invents a linear axis.
> 
> Thank you,
> 
> Daniel

Ok. That *feature* is also inherited from Matlab.

I've attached the result from Matlab (R2011b). Does it look the same as what 
Octave produces for you?

Ben

matlab.pdf
Description: Adobe PDF document