Why won't hold on work in this code?

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Hi, I am trying to plot two functions on the same graph that I have defined as

f = @(x) cos(x)-sin(x)
g = @(x) sqrt(2).*((cos(x+pi/4))

I have the bounds defined as well, and was trying to plot them by

ezplot(f,[xlow xhigh ylow yhigh]); grid on; hold on;

and then the same line using g in place of f

I have plotted multiple functions on the same plot using this code before, but cannot figure out why it won't work in this situation

Thanks

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Answer 1

dpb 2016-9-27

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Work out some trig identities but note that

>> x=[-6*pi:12*pi/100:6*pi];  % define a commensurate range of x consistent w/ ezplot
>> max(g(x)-f(x))
ans =
 1.2212e-15
>>

The two functions are idential to within a bit or two of precision. You did plot 'em both, they're just indistinguishable from each other.