R2015a plot problem with ticklabel definition

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??

Answer 1

[Walter Roberson]

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.

[Angshuman Podder]

set(hAx(2),'YTickLabel',num2str(y2(:), '%0.2f'))

Still no luck!! The negative values aren't getting printed.

[Walter Roberson]

No more tick labels will be output than you have defined for tick positions. You define the tick positions with linspace of length 5.

Your vector is long, 2001 elements. You do not want to create a tick label for each one of those.

[Angshuman Podder]

Is there a way of doing what I desire: Showing the output within bounds and in a certain format along the right axis.

[Walter Roberson]

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]

%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.

[Walter Roberson]

https://www.mathworks.com/matlabcentral/fileexchange/36254-ticklabelformat-set-a-dynamic-format-of-axes-tick-labels

Answer 2

[Spencer Chen]

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

[Angshuman Podder]

Hi, I want the y2 values to be printed on the right axis in the %0.xxf format.