how to save an array of letters in matlab ?

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tomer polsky
tomer polsky 2018-7-26
评论： tomer polsky 2018-7-26
If for example I have the English alphabet and I want to create an array of each 4 letter for exmaple : if x='abcdefghijklmnopqrstuvwxyz' then each 4 letter in my new word will be : y=afkpuz and this is my code :
clc;
clear all;
close all;
x='abcdefghijklmnopqrstuvwxyz'
array=zeros(1,length(x));
counter=0;
for i=1:5:length(x)
counter=counter+1
num2str(i)
array(counter)=(x(i))
end
but for some reason instead of getting an array of letters I get an array of numbers . How do I fix it ?

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Stephen23
Stephen23 2018-7-26
编辑：Stephen23 2018-7-26
"but for some reason instead of getting an array of letters I get an array of numbers"
Yes, because you specified array to be numeric:
array=zeros(1,length(x)); % zeros -> numeric double
and each time you allocate anything to this array MATLAB will try its best to convert it to a double (so the character gets converted to its char value). If you really want a character array, then you need to specify this, e.g.:
array = char(zeros(...));
But using a loop is very inefficient anyway, it is much simpler to use indexing:
>> x = 'abcdefghijklmnopqrstuvwxyz';
>> y = x(1:5:end)
y = afkpuz

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