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How can I multiply axis values by 1000 without changing the data?

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onamaewa on 11 Apr 2019
Edited: Rob Lander on 29 Jan 2021
With the script shown below,
for CH = 2:33
Y = (avg(:,CH) - avgBG(CH) + SP);
hold on
plot(avg(:,1), Y)
xlim([0 0.3]); xlabel('Time (s)');
ylim([-0.034 0.034]); ylabel('Position (m)');
SP = SP + 2/1000;
I've created this figure:
I want to change the Y-axis values on the figure to be multiplied by 1000.
I tried Yticks, but I don't think I've implemented it correctly. Any suggestions?

Answers (2)

Rik on 11 Apr 2019
You can either multiply the y-values with 1000, or use the YTickLabels:
ticks=get(gca,'YTicks');%retrieve current ticks
ticks=cellfun(@num2str,tick,'UniformOutput',false);%convert to cellstr
set(gca,'YTickLabels',ticks)%set new tick labels
  1 Comment
Rik on 16 Apr 2019
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Rob Lander
Rob Lander on 29 Jan 2021
Edited: Rob Lander on 29 Jan 2021
Here's another approach that seems to work (shown here for the case where you wish to change the labels for three axes):
ax = gca;
tick_scale_factor = 1000;
ax.XTickLabel = ax.XTick * tick_scale_factor;
ax.YTickLabel = ax.YTick * tick_scale_factor;
ax.ZTickLabel = ax.ZTick * tick_scale_factor;
A problem with this approach is that if you resize the figure this can cause the number of tick labels to change, which, in turn, will lead to incorrect label values. The only work-around that I know of to solve this problem is to re-exectute the code above after re-sizing.

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