Graphing a sin function - graph not appearing?

I'm trying to plot a sin function, but when the plot window shows up, nothing appears within it.

The function I'm trying to plot is y(x) = sin(2x)/(2x). Here's what I'm doing to get the graph ready:

1. x = 0:pi/100:2*pi;

2. y = sin(2*x)/(2*x);

3. plot(x,y);

I've changed the order of x and y in plot(), but that hasn't done anything for me.

What can I do to fix this?

[Bikiran Das]

x = 0:pi./100:2*pi; y = sin(2*x)./(2*x); plot(x,y);

USe this code

[Joshua Kahn]

Thank you so much, this caused the graph to appear!

Just out of curiosity, why is the addition of the "." after pi and after sin(2*x) required to fix this?

[Bikiran Das]

during division of float values use of a '.' is recommended

[Henry Giddens]

The '.' is used for element wise matrix multiplication/division. It is not actually needed after the pi in the first line of code, but is required in the second.

y1 = sin(2*x) % produces a matrix with 201 elements
y2 = 2*x %produces matrix with 201 elements

Now you need to do an element wise division between y1 and y2. For this you need to use the './' operator rather than a single '/', which is the matrix division operator

http://uk.mathworks.com/help/fixedpoint/ref/mrdivide.html

http://uk.mathworks.com/help/fixedpoint/ref/rdivide.html

Answer 1

[Bikiran Das]

x = 0:pi./100:2*pi; y = sin(2*x)./(2*x); plot(x,y);

Use this code

during division of float values use of a '.' is recommended