matplotlib-users

[Matplotlib-users] TypeError: Dimensions of C (645, 536) are incompatible with X (538) and/or Y (646); see help(pcolormesh)

[Ronquillo, E. N. <ero...@la...>]

Hello,
I am getting this error when I try calling pcolormesh this way:

pcolormesh(x, y, data.T, cmap=cmap, vmin=0, vmax=100)

I am doing the transpose of data so I don't know what could be causing this. By the way, it does work with some images. Any suggestions?

Thanks in advance

Re: [Matplotlib-users] TypeError: Dimensions of C (645, 536) are incompatible with X (538) and/or Y (646); see help(pcolormesh)

[Benjamin R. <ben...@ou...>]

It looks like your X data is one element larger than it needs to be. I know
pcolor() accepts grids that are (N+1,M+1), and I *think* pcolormesh does
the same. It will also accept grids that are (N,M) as well, but will drop
the last row and collumn.

Given your statement that it sometimes works, I suspect you have a bug in
your code somewhere that is causing your Xs and Ys to not always be exactly
the length you'd expect them to be.

I hope that helps!
Ben Root


On Mon, Jun 29, 2015 at 2:06 PM, Ronquillo, Edgar Nahum <ero...@la...
> wrote:

>  Hello,
>
> I am getting this error when I try calling pcolormesh this way:
>
>
>
> pcolormesh(x, y, data.T, cmap=cmap, vmin=0, vmax=100)
>
>
>
> I am doing the transpose of data so I don’t know what could be causing
> this. By the way, it does work with some images. Any suggestions?
>
>
>
> Thanks in advance
>
>
> ------------------------------------------------------------------------------
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> GigeNET's Cloud Solutions provide you with the tools and support that
> you need to offload your IT needs and focus on growing your business.
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Re: [Matplotlib-users] TypeError: Dimensions of C (645, 536) are incompatible with X (538) and/or Y (646); see help(pcolormesh)

[Eric F. <ef...@ha...>]

On 2015/06/30 6:41 AM, Benjamin Root wrote:
> It looks like your X data is one element larger than it needs to be. I
> know pcolor() accepts grids that are (N+1,M+1), and I *think* pcolormesh
> does the same. It will also accept grids that are (N,M) as well, but
> will drop the last row and collumn.

Yes, pcolormesh and pcolor use the same argument parsing and checking. 
They actually *want* N+1, M+1; the *acceptance* of N, M is a matlab-ism 
that is convenient for quick looks, but is also a potential source of error.

The OP has an X dimension of M+2, which indicates an error earlier in 
the OP's code.

Eric

Re: [Matplotlib-users] TypeError: Dimensions of C (645, 536) are incompatible with X (538) and/or Y (646); see help(pcolormesh)

[Ronquillo, E. N. <ero...@la...>]

Yeah it makes sense. I still can't find the bug, which it most likely is. I will keep looking and see what i find.

Thanks for the help

-----Original Message-----
From: Eric Firing [mailto:ef...@ha...] 
Sent: Tuesday, June 30, 2015 1:11 PM
To: mat...@li...
Subject: Re: [Matplotlib-users] TypeError: Dimensions of C (645, 536) are incompatible with X (538) and/or Y (646); see help(pcolormesh)

On 2015/06/30 6:41 AM, Benjamin Root wrote:
> It looks like your X data is one element larger than it needs to be. I 
> know pcolor() accepts grids that are (N+1,M+1), and I *think* 
> pcolormesh does the same. It will also accept grids that are (N,M) as 
> well, but will drop the last row and collumn.

Yes, pcolormesh and pcolor use the same argument parsing and checking. 
They actually *want* N+1, M+1; the *acceptance* of N, M is a matlab-ism that is convenient for quick looks, but is also a potential source of error.

The OP has an X dimension of M+2, which indicates an error earlier in the OP's code.

Eric

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https://www.gigenetcloud.com/
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