How the property 'textstep' modify my contour graph?

I would like to know how change my contour graph if I modify de property 'textstep'. I don't understand the description "interval between labeled contour lines, specified as a scalar numeric value¨".

Thanks

[darova]

Do you have any picture?

Answer 1

[Adam Danz]

TextStep controls which contours are labeled.

Consider this example.

% produce contour plot example. 
x = -2:0.2:2;
y = -2:0.2:3;
[X,Y] = meshgrid(x,y);
Z = X.*exp(-X.^2-Y.^2);
[~, C] = contour(X,Y,Z,'ShowText','on');

Note that the contour labels are [.1, .2, .3, ...] (image below, left)

Look at the current TextStep value.

>> C.TextStep
ans =
          0.1
>> 

Double the value

C.TextStep = 0.2

Note the change in text labels. (image below, right)

A common approach is to set TextStep as a factor of LevelStep.

C.TextStep = C.LevelStep*2; 

[Giovanni Bambini]

This doesn't work in my case. I specified the level in the contourf function