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

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Iron1759 on 3 Jan 2021
Answered: Iron1759 on 14 Jan 2021
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?

Iron1759 on 14 Jan 2021
Thanks, it works..

Mischa Kim on 3 Jan 2021
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)));
Mischa Kim on 10 Jan 2021
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.