changing axis values into names

Hi,

I have the following Problem:

I created a variable that is either 1 or -1, depending on other factors, which are irrelevant for the Problem itself. Now I would like to plot the results using this code:

myData(:,1)=[726792 726793 726794 726796 726799 726800 726801 726802 ];
myData(:,2)=[1 1 1 -1 -1 1 1 -1];

plot (myData(:,1),myData(:,2))

axis([min(myData(:,1)) max(myData(:,1)) -2 2])

datetick('x','mmmyyyy')

That is woking fine, however instead of having -1 and 1 on the yaxis, I would like to have exactly this plot but on the y axis at the Point where now a 1 is Standing, i would like to write "contango" and at -1, I would like to write "backwardation". Is this somehow possible?

Answer 1

[Mischa Kim]

Locks, add to your code

 ax = gca;
 ax.YTick      = [-1,1];
 ax.YTickLabel = {'contango','backwardation'};

[Locks]

thanks a lot for your help!

I tried this:

myData(:,1)=[726792 726793 726794 726796 726799 726800 726801 726802 ];
myData(:,2)=[1 1 1 -1 -1 1 1 -1];

plot (myData(:,1),myData(:,2))

axis([min(myData(:,1)) max(myData(:,1)) -2 2])

datetick('x','mmmyyyy')

   ax = gca;
   ax.YTick      = [-1,1];
   ax.YTickLabel = {'contango','backwardation'};

Unfortunately, it does not work and I get the following warning: ??? Warning: Struct field assignment overwrites a value with class "double". See MATLAB 7.0.4 Release Notes, Assigning Nonstructure Variables As Structures Displays Warning for details.

Is there anything I need to change in addition? I am using R2012a

[Star Strider]

Mischa’s commands are for R2014b.

For R2012a, you need to change the assignments to:

set(gca, 'YTick', [-1,1], 'YTickLabel', {'contango','backwardation'})

[Locks]

perfect, exactly what I needed, thanks to both of you.

[Moslem Uddin]

I want to chane for just one point, all others will be the same . what to do ?

[Steven Lord]

Create a sample plot and retrieve the handle of the axes containing it.

h = plot(1:10, 1:10);
ax = ancestor(h, 'axes');

Retrieve the Y tick labels.

yL = ax.YTickLabel;

Change the retrieved labels.

yL{3} = '-999';

Update the labels in the axes.

ax.YTickLabel = yL;

Answer 2

[Erenca]

If you wish to do it using the graphical interface, follow these steps (i am using R2015b)

• Plot the figure.
• On the figure window choose 'Edit' dropdown menu.
• On the edit dropdown menu click on 'Axes properties...'
• On the newly opened window you will see 'Ticks...' button on lower right hand side, click on it
• Now you can replace the axis variables with whatever you want, be it number or string

best- erenca