MATLAB: How to scale the length of the x-axis/graph

axisrescalingscaling

Hey,

I am plotting several 2D-profiles one after another with the same Matlab-script by just changing the input files. The x-axis displays the profile meter, e.g. goes from 0m to 100m and the y-axis the depth. I want to scale the x-axis in such way that 10m in both plots are the same (e.g. if you want so 1cm).

Is that possible? So I want to use the xlim for scaling, but how?

More info:

– I save the pictures as .eps if that makes a difference…

– Matlab 2015b

Edit: I added a picture

Best Answer

That property is governed by the Position property of the axis.

Here is an example:

figure
subplot(2,1,1), plot(100*rand(20,1),rand(20,1))
xlim([0 100])
set(gca,'Position',[0.1300 0.5838 0.7750 0.3412])
subplot(2,1,2), plot(50*rand(20,1),rand(20,1))
xlim([0 50])
set(gca,'Position',[0.1300 0.1100 0.7750/2 0.3412])

I don't manipulate this very often, so this may not be the best way.

Before setting those position, I first did

get(gca,'Position')

for each subplot, to see what the starting positions were. They were the vectors

[0.1300 0.5838 0.7750 0.3412]

for the top subplot, and

[0.1300 0.1100 0.7750 0.3412]

for the bottom subplot. These vectors are

[xstart ystart xwidth yheight]

Then, notice that I changed the xwidth of the bottom subplot, to half of the default. In your case, you'd want to manipulate that according to whatever you choose.

Here is the resulting figure:

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MATLAB: How to add tick just for the left axis

Here are two methods to show ticks only on the left axis.

Use yyaxis

This method creates a 2nd y axis on the right that is independently customizable and not used (unless you want to use it).

ax = axes(); 
box(ax, 'on')  % default

% Set axis tick length and direction
ax.XAxis.TickLength = [0 0];
ax.YAxis.TickDirection = 'both';
% Create 2nd y-axis on right and set y axes colors
% to match the x-axis color
yyaxis right
ax2 = gca(); 
ax.YAxis(1).Color = ax.XAxis.Color; 
ax.YAxis(2).Color = ax.XAxis.Color; 
% Remove ticks on right axis
ax.YAxis(2).TickValues = []; 
% Return control back to the left axes
yyaxis left

See image below for results.

Use xline and yline at axis limits

ax = axes(); 
box(ax, 'off')  % default
ax.XAxis.TickLength = [0 0];

If you want the y-ticks to be in both directions,

ax.YAxis.TickDirection = 'both';

If you want the right and upper axes lines but without ticks, you can make is appear as though 'box' is 'on' by setting the axis limits and adding a xline and yline.

% This syntax just sets the axis limits to their current value
xlim(ax, xlim(ax))
ylim(ax, ylim(ax))
% Set right and upper axis lines to same color as axes
xline(max(xlim(ax)), 'k-', 'Color', ax.XAxis.Color)
yline(max(ylim(ax)), 'k-', 'Color', ax.YAxis.Color)

If the axis limits change after this change, the pseudo-box lines will no longer be positioned correctly so this should happen after all other plotting and positioning is done on the axes. The first method is therefore safer.

Final result for both methods

MATLAB: How can i set middle tick

To turn on 'minor' ticks:

set(gca,'XMinorTick','on')

What's a side tick? Check out all the properties of ticks you can set:

https://www.mathworks.com/help/matlab/ref/matlab.graphics.axis.axes-properties.html#d119e53241

Best Answer

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MATLAB: How to add tick just for the left axis

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