MATLAB Not properly plotting graph

Question

It seems that my MATLAB has some sort of trouble plotting anything that is over tan(x). For example, trying to plat (tan(x) + sin(x))/(2*tan(x)):

clc
clear all

x = 0:0.1:pi;

y1 = cos(x/2).^2;
subplot(1,2,1);
plot(x, y1);

y2 = (tan(x) + sin(x))/(2*tan(x));
subplot(1,2,2);
plot(x, y2);

I've tried putting it on it's own plot as well, but all I seem to get is a blank graph, but the axes are all lined up for the range I've set. The only thing that has made anything appear is removing the tan(x) on the bottom.

Answer 1

You should use the element-wise division operator ./ :

y2 = (tan(x) + sin(x))./(2*tan(x));

Indeed with a = (tan(x) + sin(x)) and b = (2*tan(x)) , what you wrote is:

y2 = a / b;

which is matrix division, y2 = a * pinv(b) , a scalar number in this case.

NB: As b cannot be inverted, matlab uses pseudo-inverse pinv