Store strings in a loop into an array?

Question

I am working in MATLAB and currently have this code:

for i =1:142674:loop_end
data = textread('Results.txt', '%s');
name = data{i};
end

However, I want the name of the data point I select to be stored into an Array where the first name would be the first string in the array and so forth. So at the end I have an array containing all the names gathered from the loop.

An array can't have strings as keys. Arrays/matrices can only have integers as keys. You have to use cell arrays for that as you have started to do. — kkuilla
– kkuilla, Commented Jul 11, 2014 at 14:14
Maybe Categorical arrays would work for you if your names are a finite set. — kkuilla
– kkuilla, Commented Jul 11, 2014 at 14:21

Sifu · Accepted Answer · 2014-07-11 15:22:59Z

1

What about this:

counter = 0
for i =1:142674:loop_end
    counter = counter + 1;
    data = textread('Results.txt', '%s');
    myArray{counter} = data{i};
end

myArray will contain the names.

> myarray = 'Name1'  'Name2'  'Name3'  'Name4'

Though, it will actually be a Cell array, not a regular array

edited Jul 11, 2014 at 15:22

answered Jul 11, 2014 at 15:05

Sifu

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8 Comments

CitizenInsane Over a year ago

Side-note: In your code, because iteration is stepped iteration (1:142674:loop_end), myArray will contain many empty entries.

Sifu Over a year ago

@CitizenInsane You are right, thanks for noting. I fixed it by adding a counter.

Prefoninsane Over a year ago

that works. how can I then call upon the array in a loop to saveas like this: for i:array.length saveas(gcf, 'Name', 'jpeg') ; end So I would have the file name saving as a different name each time and getting those names for the array I created... but I would want the

Sifu Over a year ago

@user3145111 You can call any string in your array by using myArray{InsertIndexNumberHere}. ie: myArray{2} would give the second Name.

Prefoninsane Over a year ago

Keep saying, index exceeds matrix dimensions. The array is a 1x6, and the loop goes from 1:6...?

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CitizenInsane · Accepted Answer · 2014-07-11 15:09:03Z

1

Why to read the text file multiple times ?

data = textread('Results.txt', '%s');
names = data(1:142674:end);

This way names is a cell array containing 1st, 142675th, etc... strings in the file.

NB: Well maybe I've misunderstood the question.

answered Jul 11, 2014 at 15:09

CitizenInsane

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2 Comments

Sifu Over a year ago

Your answer is much faster and optimized. I personnaly think yours is much better than mine. +1

CitizenInsane Over a year ago

Thanks ... The problem is solved, that's the most important ;)

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