How to change polar histogram plot border thickness?

I am trying to change the thickness of the arc that defines the border of a polar histogram plot. I can successfully change the thickness of the ticks using LineWidth, but I am not finding a command that allows me to alter the thickness of the border arc.

Is it possible?

Alternatively, I am also trying to draw a new arc to superimpose over the existing one, but am failing to draw the arc from 0° to 90°. It always goes from 0° to the center instead.

d=linspace(0,pi/2); 
t=cos(d);
r=sin(d);
hold on;
polarplot(t,r,'LineWidth',4)
hold off;

How do I change the arc so that it goes from 0° to 90°?

I've tried setting r=1, which seems like it should fix it, but then nothing shows up at all. What am I missing?

Answer 1

[Oggie Golub]

I no longer need help with this, I just figured it out on my own.

The reason r=1 didn't work was because "the inputs must be vectors with equal length or matrices with equal size." So I had 100 angles from 0,pi/2 but only 1 radius.

For anyone who may be caught in a similar situation, the following code fixed the issue.

t = linspace(0,pi/2,100);
r = ones(100,1);
hold on;
polarplot(t,r,'LineWidth',4); 
hold off;

However, I would still like to know if it's possible the simply change the thickness of the original border. I would much prefer that option as opposed to adding another element to the plot.