i need to convert a string to a num without using the "str2num" function but in the final answer i have some undesired spaces. how can i remove them?

st = '23487';

x = double(st);

y = x-48;

y = 2 3 4 8 7

i want this in "normal" format of "23487"...

[Image Analyst]

Is this a Homework question? If so, we'll give hints, but not the answer.

[Matt Fig]

^Or so one would hope...

Here is how to do it without the str2num function:

N = str2double('1234')

Answer 1

[Azzi Abdelmalek]

st = '14523'
x = double(st)
y = sum((x-48).*10.^(numel(st)-1:-1:0))

[Zaza]

of course! represent '23487' as 2*10^4+3*10^3+4*10^2+8*10^1+7*10^0... i should've think better on this one. thanks Azzi :)

Answer 2

[Andrei Bobrov]

out = (st-'0')*10.^(numel(st)-1:-1:0)';

or from Cody

out = polyval(st-'0',10);