MATLAB: Manipulating X-Axis Values

axisplot

I made a line plot of a 30×1 matrix. Of course the values on the x-axis are 1-30 but I need to add 1970 to each of those because the axis is supposed to represent a year. Is there a way to add 1970 to each of the x-axis values? Thanks in advance.

Best Answer

One approach:

x = ...;
y = ...;
figure(1)
plot(x, y)
grid
xt = get(gca, 'XTick');
xtl = linspace(1970, 2000, numel(xt));
set(gca, 'XTick',xt, 'XTickLabel',xtl)

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See if:

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

does what you want. That will reverse the x-axis direction, and the data associated with it, so the x-axis coordinates and the x-values of the data remain the same.

Otherwise, try something like this if you only want to reverse the axis labels and not the axis values themselves:

figure
plot(1:100, rand(1,100))
xt = get(gca, 'XTick');
xtr = linspace(max(xt), min(xt), numel(xt));
set(gca, 'XTick',xt, 'XTickLabel',sprintfc('%.1f', xtr))

you can also use the compose function:

set(gca, 'XTick',xt, 'XTickLabel',compose('%.1f', xtr))

Best Answer

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