Problem about plotting 2D about multiple of functions

Hi.

I started Matlab recently. I wanted to draw this graph but Matlab always say this error.

x = 0:pi/100:6*pi;
y = floor(sin(x)) * floor(x);
plot(x,y);
Error using  * 
Inner matrix dimensions must agree.

Is it possible to help me? I'm sorry for bad English too.

Thanks.

Answer 1

[Mischa Kim]

Amin, use instead

 y = floor(sin(x)) .* floor(x); % notice the period before the *

This allows you to do element-wise multiplication.

[Amin Bor]

Thanks for answer. I have another question. when I draw a graph like my graph in my question It's like this. my problem is that the circle that I showed is only one point and there is no line between this point and my graph but Matlab joint this points with a line to my graph. Is it possible to change this property? Thanks again.