CODEWITHSUNDEEP
matlabprintf
user3084967
user3084967

Reputation: 1

MATLAB - finding the index of a string in a vector

I am trying to print out a very simple table (using fprintf) showing statistics on a set of data I've acquired.

I'm new to Matlab, but - me being used to Java - I think this should work...

Labels = ['Max','Min','Mean','Median','Std. Dev.','Tol. Range'];
for i = 1:6
    fprintf('| %c | %4.3f | %4.3f |\n', Labels(i), unmodVals(i), modVals(i));
end

But it doesn't work. :(

For some reason, array indexing for strings doesn't work the same way as it does in Java so i'm completely lost.

it ends up printing out something like:

| M |    ####    |    ####    |
| a |    ####    |    ####    |
| x |    ####    |    ####    |
| M |    ####    |    ####    |
| i |    ####    |    ####    |
| n |    ####    |    ####    |

Can someone point me in the right direction?

Upvotes: 0

Views: 156

Answers (2)

Autonomous
Autonomous

Reputation: 9075

You are storing strings in an array called Labels. In MATLAB, when you write ['a', 'bc'], it concatenates two strings and produces abc. Therefore, you should use cell arrays to store strings of different sizes. 

Labels = {'Max','Min','Mean','Median','Std. Dev.','Tol. Range'}; %notice the curly braces.

%generating random values of `unmodVals` and `modVals`
unmodVals=randi(1000,[1 6]);
modVals=randi(1000,[1 6]);
for i = 1:6
    fprintf('| %s | %4.3f | %4.3f |\n', Labels{i}, unmodVals(i), modVals(i)); %notice change    from `%c` to `%s`, c stands for charater, s for string.
end

Note: If you see how your Label variable looks, you will see this:

Labels = MaxMinMeanMedianStd. Dev.Tol. Range

Upvotes: 0

Praetorian
Praetorian

Reputation: 109119

Character arrays work a little differently in MATLAB. Labels is not a 1x6 array of strings like you're expecting it to be; the line you have is equivalent to

Labels = strcat('Max','Min','Mean','Median','Std. Dev.','Tol. Range');

So it's a 1x35 array of characters, and you're indexing into it one character at a time. Change Labels to a cell array of strings as below. You must index into it using braces { } instead of parentheses ( ), and change the corresponding fprintf format specifier to %s (%c is for printing characters)

Labels = {'Max','Min','Mean','Median','Std. Dev.','Tol. Range'};

for i = 1:6
    fprintf('| %s | %4.3f | %4.3f |\n', Labels{i}, unmodVals(i), modVals(i));
end

Upvotes: 2

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