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

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Iron1759 2021-1-3

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https://ww2.mathworks.cn/matlabcentral/answers/707443-how-do-i-change-axes-scale-in-a-surface-plot-by-a-predefined-factor

回答： Iron1759 2021-1-14

采纳的回答： Iron1759

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?

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Answer 1

Iron1759 2021-1-14

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https://ww2.mathworks.cn/matlabcentral/answers/707443-how-do-i-change-axes-scale-in-a-surface-plot-by-a-predefined-factor#answer_597968

Thanks, it works..

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Answer 2

Mischa Kim 2021-1-3

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https://ww2.mathworks.cn/matlabcentral/answers/707443-how-do-i-change-axes-scale-in-a-surface-plot-by-a-predefined-factor#answer_589658

在 MATLAB Online 中打开

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)));

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Iron1759 2021-1-9

在 MATLAB Online 中打开

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 2021-1-10

在 MATLAB Online 中打开

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);