String value and relate with number.

lets say i have A=21,B=12,C=8,D=7 and Matrix with string value W=['DABCD'], and now lets say when i write: Z=W(1:3) which will give result DAB string from W. and i want that to be multiplication of D*A*B which is equal to 2016.

Answer 1

[rifat]

A=21;B=12;C=8;D=7;
W=['DABCD'];
Z=W(1:3);

string=[Z(1) '*' Z(2) '*' Z(3)];
eval(string)

[Akmyrat]

thanks a lot Rifat. Appreciate your cooperation.

Answer 2

[Cedric]

Here is one solution. Assuming

 W = ['DABCD'] ;

Define

 values = [21, 12, 8, 7] ;                  % or values = [A, B, C, D] ;
 Z = @(id) prod( values(W(id)-64) ) ;       % Function lookup/prod.

Then you can use Z as a function, which works using the same syntax as the indexing used in your question statement:

 >> Z(1:3)
 ans =
        1764

Note that 7*21*12 = 1764 and not 2016.

[Akmyrat]

thanks a lot Cedric for answer. Yep i made mistake like that 8*21*12=2016.