How can I assign the value of a variable out of other variables

Question

Chewy 2015-9-21

评论： Walter Roberson 2015-9-21

I have the following three variables:

p_g = input( 'k or l', 's');
p_a = input( 'v or s', 's');
p_n = input( 'Enter number', 's');

The value of the forth variable shall be build out of the other variables:

p_k = ['p_g''p_a''p_n']

For example:

p_g = 'k'
p_a = 'v'
p_n = '15'
p_k = kv15

Walter Roberson 2015-9-21

When you write

p_k = kv15

do you mean that you want p_k to be assigned the string 'kv15' or do you mean that you want p_k to be assigned the content of the variable kv15 ?

Answer 1

Guillaume 2015-9-21

There are many ways to do this:

p_k = [p_g, p_a, num2str(p_n)]; %note the lack of quotes

Or my preference:

assert(mod(p_n, 1) == 0, 'p_n is not integer') %for the %d to work in sprintf, p_n must be integer
p_k = sprintf('%s%s%d', p_g, p_a, p_n);

And please, use more descriptive variable names.