Calling matrix values to strings

Hi, I want to write a string of letters and then define a vector that will assign numerical values to each of the letters: e.g.

>> string='zxcv'

string =

zxcv

then define a vector which allows me to assign number to the string elements and add them:

vector=[1 4 6 -9 2 7 23 -6 -8 9 10 13 4 5 -8 -12 -2 1 0 11 -8 -9 3 8 9 2];

if string(1)=z

output=vector(2)+vector(4)

disp(output)

Matlab has a problem mainly with this line - if string(1)=1

Any clues?

Answer 1

[Stephen23]

In MATLAB the equality operator is ==, not =. This is clearly shown in the documentation (see link I gave). The single equals sign is only used to assign a value to a variable.

vector = [1,4,6,-9,2,7,23,-6,-8,9,10,13,4,5,-8,-12,-2,1,0,11,-8,-9,3,8,9,2];
string = 'zxcv';
if string(1)=='z' % note == not =
    output = vector(2)+vector(4);
    disp(output)
end

displays this:

    -5

Note that for testing strings it is recommended to use strcmp or strncmp instead of array equals:

>> strncmp(string,'z',1)

rather than this:

>> string(1)=='z'

[KA]

Thank you.