how to input each element (different) of a matrix 'R' in same function 'f' and compute result in the matrix form?

• how to input each element (different) of a matrix 'R' in same function 'f' and compute result in the matrix form? *

I was trying to do this to get a series of f values in a (1x7) matrix form. Tried couple of if-loop variants, did not help. Any help is appreciated. I know this is silly, but am just very new! Thank You.

N = 7; % number of monomers % b = 1; % bond length = hypotenuse % R = rand(1, 7) f =(2 * R / (N * (b^2))) * exp(-(R^2) / (N * (b^2)))

Answer 1

[Star Strider]

You need to vectorise it.

See if this does what you want:

N = 7;                % number of monomers % 
b = 1;                % bond length = hypotenuse %
R = rand(1, 7)
f =(2 * R ./ (N * (b^2))) .* exp(-(R.^2) ./ (N * (b^2)))

See Array vs. Matrix Operations for details.

[raktim roy]

well thats useful concept. but doesn't help me use each of the element in R as an input in the function f, and collect the results for each in a matrix form. I want to do that.

Thanks though.

[Star Strider]

I don’t understand.

In your code, ‘f’ is simply a variable. It’s not a function. Your ‘R’ variable is a (1x7) vector, not a matrix.

What do you actually want to do?

Answer 2

[Roger Stafford]

You need dots on the last line:

   f = (2 * R / (N * b^2)) .* exp(-(R.^2) / (N * b^2))

[raktim roy]

oh yeah. absolutely. I figured that. Thanks.