回复： Square Values in Array?

[MerRhosyn]

I have an 1D array of type double named "E."  From each entry in "E," I want to subtract the same value, "Eg."  I then want to square each of the values in the resulting array, i.e. first value in final desired array is [E(1)-Eg]^2, second value is [E(2)-Eg]^2, etc.

It seems that MathScript will not allow me to square an array?  When I use the code

EEg=E-Eg

EEgSquared=EEg^2

I am able to obtain my array EEg just fine.  I only get an array full of zeros when I attempt to perform the squaring operation, however.

Suggestions?  Thanks.

[ttrr]

Hi,

You should use operator '.^' for element-wise square. See the following script.

a = rand(10, 1);
a = a - 1;
a = a.^2;

The '^' operator is used to perform square of matrix, i.e., A*A. Therefore, it is necessary that the matrix is square. Note that scalar in MathScript is also treated as a 1-by-1 matrix. However, a vector is not a square matrix.

In MathScript, you can always use '.' to specify that the operator is applied element-wise for a matrix or a vector, such as '.*', './'. Otherwise, MathScript performs matrix operation, which is different with scalar operation for multiplication, division, square, etc.

[MerRhosyn]

Ah, I knew there had to be a trick.  Thanks!