Aptech » Answers for "How can I create a new matrix where each element has a constant value?" http://www.aptech.com Fri, 08 Feb 2013 19:12:28 +0000 en-US hourly 1 http://wordpress.org/?v=3.4.1 By: aptech http://www.aptech.com/questions/how-can-i-create-a-new-matrix-where-each-element-has-a-constant-value/#answer-2630 http://www.aptech.com/questions/how-can-i-create-a-new-matrix-where-each-element-has-a-constant-value/#answer-2630#comments Fri, 30 Nov 2012 21:20:27 +0000 aptech http://www.aptech.com/questions/how-can-i-create-a-new-matrix-where-each-element-has-a-constant-value/#answer-2630 Continue reading →]]> You have a few choices on how to initialize a matrix where each element is equal to some constant value. Which you choose will depend upon your program and which seems most clear to you.

Here are a few methods to initialize a 2×4 matrix in which each element of the new matrix is equal to 17.

1. Use the ones or zeros functions:

const_val = 17;
new_mat = const_val * ones(2, 4);

2. Use the reshape function:

const_val = 17;
new_mat = reshape(const_val, 2, 4);

3. If you will know a particular value at compile time (meaning before any variables are assigned values), the you can use #define and the let statement.

#define CONSTVAL 17
#define NROWS 2
#define NCOLS 4
let new_mat[NROWS, NCOLS] = CONSTVAL;

You do not have to use all uppercase characters with the #define statement. However, it is a common convention to do so. It is helpful when reading code, because if you see a variable in all uppercase that is a strong hint that it is probably a #define‘ed value.

]]> http://www.aptech.com/questions/how-can-i-create-a-new-matrix-where-each-element-has-a-constant-value/#answer-2630/feed/ 0