MATLAB Central Newsreader - Display an Image with scaled axes

Display an Image with scaled axes

meni vex — Mon, 25 May 2009 14:55:03 -0400

Hi,

I have a 2D matrix, and I want to display it as an image, for example with the 'image', 'imagesc' commands, but, with my axes. I have another 2 vectors holding the x and y values, and I want to display the 2D matrix as function of them.

How can I do this?

Thanks in advance,
Meni

Re: Display an Image with scaled axes

Sadik — Mon, 25 May 2009 15:29:01 -0400

You can do

imagesc(x,y,yourImage)

but you should be careful with which axis you assign as x because imagesc shows the image as if you are viewing the matrix. The first dimension is on the y axis and the second dimension [the columns] are on the x axis...

"meni vex" <meni_vex@yahoo.com> wrote in message <gvebg7$fba$1@fred.mathworks.com>...
> Hi,
>
> I have a 2D matrix, and I want to display it as an image, for example with the 'image', 'imagesc' commands, but, with my axes. I have another 2 vectors holding the x and y values, and I want to display the 2D matrix as function of them.
>
> How can I do this?
>
> Thanks in advance,
> Meni

Re: Display an Image with scaled axes

meni vex — Tue, 26 May 2009 22:40:21 -0400

Thanks, but I already tried it, and it gave me the same results as imagesc(myImage), except a change of the axis labels...
Also in the Matlab doc. they say that it will only change the axes labels, and indeed that was the only change, I mean I expected the graph to change also (due to new scaling of axes) but nothing...
Am I missing something here? any other suggestion?

"Sadik " <sadik.hava@gmail.com> wrote in message <gvedft$irt$1@fred.mathworks.com>...
> You can do
>
> imagesc(x,y,yourImage)
>
> but you should be careful with which axis you assign as x because imagesc shows the image as if you are viewing the matrix. The first dimension is on the y axis and the second dimension [the columns] are on the x axis...
>
>
> "meni vex" <meni_vex@yahoo.com> wrote in message <gvebg7$fba$1@fred.mathworks.com>...
> > Hi,
> >
> > I have a 2D matrix, and I want to display it as an image, for example with the 'image', 'imagesc' commands, but, with my axes. I have another 2 vectors holding the x and y values, and I want to display the 2D matrix as function of them.
> >
> > How can I do this?
> >
> > Thanks in advance,
> > Meni

Re: Display an Image with scaled axes

Pekka Kumpulainen — Wed, 27 May 2009 07:08:01 -0400

"meni vex" <meni_vex@yahoo.com> wrote in message <gvhr4l$14d$1@fred.mathworks.com>...
> Thanks, but I already tried it, and it gave me the same results as imagesc(myImage), except a change of the axis labels...
> Also in the Matlab doc. they say that it will only change the axes labels, and indeed that was the only change, I mean I expected the graph to change also (due to new scaling of axes) but nothing...
> Am I missing something here? any other suggestion?
>
> "Sadik " <sadik.hava@gmail.com> wrote in message <gvedft$irt$1@fred.mathworks.com>...
> > You can do
> >
> > imagesc(x,y,yourImage)
> >
> > but you should be careful with which axis you assign as x because imagesc shows the image as if you are viewing the matrix. The first dimension is on the y axis and the second dimension [the columns] are on the x axis...
> >
> >
> > "meni vex" <meni_vex@yahoo.com> wrote in message <gvebg7$fba$1@fred.mathworks.com>...
> > > Hi,
> > >
> > > I have a 2D matrix, and I want to display it as an image, for example with the 'image', 'imagesc' commands, but, with my axes. I have another 2 vectors holding the x and y values, and I want to display the 2D matrix as function of them.
> > >
> > > How can I do this?
> > >
> > > Thanks in advance,
> > > Meni

Have you tried surface? That might be what you want..

Re: Display an Image with scaled axes

meni vex — Sun, 31 May 2009 09:36:01 -0400

Working fine! thank you so much Pekka!

"Pekka Kumpulainen" <pekka.nospam.kumpulainen@tut.please.fi> wrote in message <gviosh$7et$1@fred.mathworks.com>...
> "meni vex" <meni_vex@yahoo.com> wrote in message <gvhr4l$14d$1@fred.mathworks.com>...
> > Thanks, but I already tried it, and it gave me the same results as imagesc(myImage), except a change of the axis labels...
> > Also in the Matlab doc. they say that it will only change the axes labels, and indeed that was the only change, I mean I expected the graph to change also (due to new scaling of axes) but nothing...
> > Am I missing something here? any other suggestion?
> >
> > "Sadik " <sadik.hava@gmail.com> wrote in message <gvedft$irt$1@fred.mathworks.com>...
> > > You can do
> > >
> > > imagesc(x,y,yourImage)
> > >
> > > but you should be careful with which axis you assign as x because imagesc shows the image as if you are viewing the matrix. The first dimension is on the y axis and the second dimension [the columns] are on the x axis...
> > >
> > >
> > > "meni vex" <meni_vex@yahoo.com> wrote in message <gvebg7$fba$1@fred.mathworks.com>...
> > > > Hi,
> > > >
> > > > I have a 2D matrix, and I want to display it as an image, for example with the 'image', 'imagesc' commands, but, with my axes. I have another 2 vectors holding the x and y values, and I want to display the 2D matrix as function of them.
> > > >
> > > > How can I do this?
> > > >
> > > > Thanks in advance,
> > > > Meni
>
> Have you tried surface? That might be what you want..