set(gca,'fontsize',[]) reporting error

Hi all, I bumped into a simple problem but I do not know what is going on.

I was trying to make a plot and seting up the font size (like I had done many times before). But this time matlab returns an error that I do not really understand, here is my code:

load('sim5.mat')
maxs=smooth(maxs);

figure
hold on
plot(maxs,ko,'LineWidth',5)
xlabel('success probability')
ylabel('number of tags')

set(gca,'fontsize',18)

box off

and at

set(gca,'fontsize',18)

maltab reports this error:

Unrecognized property 'fontsize' for class 'matlab.ui.Figure'.

I am not sure what is going on here?

[Walter Roberson]

What output do you get if you ask to display

gca

It sounds as if you are getting a figure instead of an axes, which is strange.

What shows up for

which -all gca

[Xingda Chen]

ok i ran today and all is good. I am going to close this since the problem exists no more although I still don't know what went wrong.

Answer 1

[Image Analyst]

Just set font size explicitly in xlabel():

load('sim5.mat')
maxs=smooth(maxs);

figure
hold on
plot(maxs, ko, '-', 'LineWidth', 5);
grid on;
fontSize = 18;
title('ko vs. maxs', 'FontSize', fontSize)
xlabel('success probability', 'FontSize', fontSize)
ylabel('number of tags', 'FontSize', fontSize)
box off

Answer 2

[Walter Roberson]

maybe you had happened to do

gca = (a figure)

For historical reasons, if you had happened to do something like

gca = 1
set(gca, 'fontsize', 18)

then provided that a figure existed with that figure number, you would get the error message that you received.

[Image Analyst]

For what it's worth, this works for me in r2021a:

figure
hold on
plot(1:10, 'LineWidth',5)
xlabel('success probability')
ylabel('number of tags')

set(gca,'fontsize',18) % Works - no problem.
gca.FontSize = 18 % More modern OOP way -- also works.