How do I change axes scale in a surface plot by a predefined factor?

Hello,

I have a surface plot -

on x axis - [0,1,2.... 15];

on y axis - [0,1,2,...50];

I'd like to change the axes scale by multiply these two vector by a factor (different one on each axis), for exmaple by 12.5578 and thus changing only the axes lables.

I'm familair with XtickLabel and YTickLabel but I think it's less applicatble, mainly becaue this factor is not round.

Real life example - for instance when you want to change reperesntation from pixles to real units without changing the data.

Any thoughts?

Answer 1

[Iron1759]

Thanks, it works..

Answer 2

[Mischa Kim]

Iron, if it just about changing the labels simply use xticklabels(). See the example below:

x = linspace(-10,10,200);
y = cos(x);
plot(x,y)

xticklocs = [-3*pi -2*pi -pi 0 pi 2*pi 3*pi];
xticks(xticklocs);
myfac     = 10;  % this would be your 12.5578
xticklabels(cellstr(num2str(xticklocs'*myfac)));

[Iron1759]

Thank you, Mischa.

It did work; however, there is one pitall, the labels are in intervals of 'myfac' which are not round and not quite esthetic. There is probably a way to 'normalise' them and to circumvent the problem, I just need to think about it further :)

If you do have something on the top of your head, please share..

Thanks

[Mischa Kim]

Understood. In this case just go the other way around. Decide where you want your tick labels (the nice numbers) and then divide (instead of multiplying) by myfac to get the xticklocs.

[Iron1759]

I don't know if it's only me but I didn't quite get it.

xticklocs/yticklocs are both 1D arrays after 'conversion' from nanometers (that I want to present) to a different unit.

Then, I don't get a display of my surface (after I used meshgrid).

xticklabels(cellstr(num2str(x))); % 0:10:200
yticklabels(cellstr(num2str(y))); % 0:10:200
Multi_x = multiplier_x; % = ~11.93
Multi_y = multiplier_y; % = ~ 3.98

xticklocs = x./Multi_x; 
yticklocs = y./Multi_y;

xticks(xticklocs);
yticks(yticklocs);

[Mischa Kim]

See this example:

x = linspace(-10,10,200);
y = cos(x);
figure(1)
plot(x,y)
xticklocs = [-3*pi -2*pi -pi 0 pi 2*pi 3*pi];
xticks(xticklocs);

figure(2)
plot(x,y)
xticklocs = -400:80:400; % these are the nice numbers
myfac     =  400/(3*pi);
xticklabels(cellstr(num2str(xticklocs.')));
xticks(xticklocs/myfac);

If this does not help, share your code so I can provide specific input.