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From: Michael Coughlin on 13 May 2010 15:35
Hi,

So this should be simple for someone to answer, I have looked through the information on axes and not quite found what I am looking for.

I produce a plot with imagesc, which works well. So let us imagine that my x and y values go from 0 to 100. On the x and y axes then, it says that they go from 0 to 100, which makes perfect sense. How do I make it such that the x axes label says it goes from say 0 to 200 (even though it does not) and maybe the y label says it goes from -50 to 50. Does that make sense?

Thank you,
Michael
From: ImageAnalyst on 13 May 2010 15:54
Michael Coughlin
Look up ticks in the help and you'll find info, plus this example:

x = -pi:.1:pi;
y = sin(x);
plot(x,y)
set(gca,'XTick',-pi:pi/2:pi)
set(gca,'XTickLabel',{'-pi','-pi/2','0','pi/2','pi'})
From: Alan B on 13 May 2010 16:38
ImageAnalyst <imageanalyst(a)mailinator.com> wrote in message <5f9c658f-c570-4c01-b9c5-4bcb27d8a4b9(a)k2g2000yqe.googlegroups.com>...
> Michael Coughlin
> Look up ticks in the help and you'll find info, plus this example:
>
> x = -pi:.1:pi;
> y = sin(x);
> plot(x,y)
> set(gca,'XTick',-pi:pi/2:pi)
> set(gca,'XTickLabel',{'-pi','-pi/2','0','pi/2','pi'})

A possibly simpler solution is to call imagesc with the axes arguments, so Matlab can handle the axes in the normal way...
>> imagesc(xticks,yticks,im)

imagesc() is essentially equivalent to image(), so you can see the actual documentation for it with
>> help image
From: Michael Coughlin on 13 May 2010 20:39
Hi,

That works very well! One last question: the y axis has its values inverted whether I flip the y vector values or not. Is there a way to turn on ascending or descending order to force it to do it one way?

Michael

"Alan B" <monguin61REM(a)OVETHIS.yahoo.com> wrote in message <hshnvc$g75$1(a)fred.mathworks.com>...
> ImageAnalyst <imageanalyst(a)mailinator.com> wrote in message <5f9c658f-c570-4c01-b9c5-4bcb27d8a4b9(a)k2g2000yqe.googlegroups.com>...
> > Michael Coughlin
> > Look up ticks in the help and you'll find info, plus this example:
> >
> > x = -pi:.1:pi;
> > y = sin(x);
> > plot(x,y)
> > set(gca,'XTick',-pi:pi/2:pi)
> > set(gca,'XTickLabel',{'-pi','-pi/2','0','pi/2','pi'})
>
> A possibly simpler solution is to call imagesc with the axes arguments, so Matlab can handle the axes in the normal way...
> >> imagesc(xticks,yticks,im)
>
> imagesc() is essentially equivalent to image(), so you can see the actual documentation for it with
> >> help image
From: ImageAnalyst on 13 May 2010 20:46
On May 13, 8:39 pm, "Michael Coughlin" <cough...(a)carleton.edu> wrote:
> Hi,
>
> That works very well! One last question: the y axis has its values inverted whether I flip the y vector values or not. Is there a way to turn on ascending or descending order to force it to do it one way?
>
> Michael
----------------------------------------------------------------------------
from the help on axes properties:

XDir, YDir, ZDir

{normal} | reverse

Direction of increasing values. A mode controlling the direction
of increasing axis values. Axes form a right-hand coordinate system.
By default,

*

x-axis values increase from left to right. To reverse the
direction of increasing x values, set this property to reverse.

set(gca,'XDir','reverse')

*

y-axis values increase from bottom to top (2-D view) or
front to back (3-D view). To reverse the direction of increasing y
values, set this property to reverse.

set(gca,'YDir','reverse')

*

z-axis values increase pointing out of the screen (2-D view)
or from bottom to top (3-D view). To reverse the direction of
increasing z values, set this property to reverse.

set(gca,'ZDir','reverse')
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