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R2015a plot problem with ticklabel definition

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Angshuman Podder
Angshuman Podder on 21 Feb 2020
Commented: Walter Roberson on 24 Feb 2020
x = 0:0.01:20;
y1 = 200*exp(-0.05*x).*sin(x);
y2 = 0.8*exp(-0.5*x).*sin(10*x);
figure % new figure
[hAx,hLine1,hLine2] = plotyy(x,y1,x,y2);
title('Multiple Decay Rates')
xlabel('Time (\musec)')
ylabel(hAx(1),'Slow Decay') % left y-axis
set(hAx(1),'ytick',-200:50:200)
set(hAx(2),'ytick',linspace(-0.8,0.8,5),'YTickLabel',num2str(y2(:), '%0.1f'))
When I run this, I get only positive values for the y axis on the right and the values aren't correct. Any solution??

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Answers (2)

Walter Roberson
Walter Roberson on 21 Feb 2020
Edited: Walter Roberson on 21 Feb 2020
You only ask for 5 ticks in your linspace, with labels derived from y2 not from what you linspace. Your first 5 y2 values are all positive.

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Walter Roberson
Walter Roberson on 22 Feb 2020
hAx(2).YRuler.TickLabelFormat = '%0.1f';
without setting the YTick or YTickLabel properties (unless the automatically generated values turn out not to be good enough.)
This requires R2014b or later.
Angshuman Podder
Angshuman Podder on 24 Feb 2020
%No public field TickLabelFormat exists for class matlab.graphics.axis.decorator.NumericRuler.
%Error in plotdemo (line 83)
%hAx(2).YRuler.TickLabelFormat = '%0.1f';
The above error pops up. I'm using R2015a.

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Spencer Chen
Spencer Chen on 21 Feb 2020
Well, you have set you ytick labels to:
num2str(y2(:), '%0.1f')
Maybe you meant?
num2str(linspace(-0.8,0.8,5), '%0.1f')
Blessings,
Spencer

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Angshuman Podder
Angshuman Podder on 21 Feb 2020
Hi, I want the y2 values to be printed on the right axis in the %0.xxf format.

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