Why won't my hold on work?

I am trying to plot a piece wise function using fplot. The code won't retain the previous graphs. I tried even using the example code that is online with mathwork and even that doesn't work! it only plots the second equation! What is going with matlab!?

This is my code

clc; clf;
fplot(@(x) ((-1/4)*x^2 + 11.8125),[0 6],'r')
hold on 
fplot(@(x) ((-1/4)*x^2 + 11.8125 + .5*(x-6)^2),[6 12],'r')
hold off
grid on

This is the code from mathwork that I pretty much copied. Same idea, I just needed different equations. Neither work!I think something is wrong with my hold on.

fplot(@(x) exp(x),[-3 0],'b')
hold on
fplot(@(x) cos(x),[0 3],'b')
hold off
grid on

[Walter Roberson]

Which MATLAB version are you using, on which operating system?

The above is all working for me, R2016b, OS-X

And just in case: what does

which hold

report?

[Jay Gersten]

I'm using R2015a, on OS-X

[Jay Gersten]

I tried hold on in a different setting and it worked fine. Perhaps this doesn't work in the older version? Does that make sense? This seems like a basic function that should have been able to be done in earlier versions....

Answer 1

[Walter Roberson]

The problem is not hold on, the problem is fplot, which in R2015a made no attempt to check to see if it was on a held axes. R2016a is the first version of fplot that respects hold on

[Jay Gersten]

Thank you. They should definitely specify that it only works in the latest edition. That was much wasted time and effort. Appreciate the tip.