Error: 'Matrix dimensions must agree' even when using a scalar to multiply with Matrix.

Hello, I am actually multiplying the matrix with a scalar, if I however take the user input for the scalar it displays error as :* Error using '*' Inner matrix dimensions must agree.*

Part of my code that uses this is:

scale = ('Enter the scale for noise to be added to the signal, scale = ');
n=linspace(0,2*pi,N);
s=sin(2*pi*n);
v=randn(1,N);
x=s+v*scale;

However if I implicitly mention the scalar in m-file it works perfectly. The following code works:

scale = 0.2;
n=linspace(0,2*pi,N);
s=sin(2*pi*n);
v=randn(1,N);
x=s+v*scale;

I am a noob, so please be gentle. Any help would be appreciated. Thank you!

Answer 1

[Evan]

Based on the code you placed here, it looks like your first line is missing an input function and is instead just creating a string with the text given. It should read:

 scale = input('Enter the scale for noise to be added to the signal, scale = ');

[Mr. A]

I am frankly ROFLing at myself for this. I had never imagined I could be stupid to this level. I think I must get some sleep before continuing with my project. Thank you so much. You're a life saver. :)

[Evan]

Haha, no worries--it happens to everyone. I once did much the same thing in a question here. Except I went one further and swore up and down that it must have been a bug in my version of Matlab. :P