# function input and output

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Carl Narup on 5 Oct 2017
Answered: Niels on 5 Oct 2017
Im creating a function where MPcell1 is a cell with 24 artist names of songs, unic is a cell with 11 unique artist names. I want the second row of the unic cell to add a 1 everytime unic = MPcell1 but that isn't happening. What is wrong with this?
function totsum = songsum(MPcell1, unic, c)
for i = 1:length(MPcell1)
if MPcell1(i) == unic
totsum = unic(2,c)+1;
c = c+1;
end
end
end
James Tursa on 5 Oct 2017
Every time MPcell1(i) matches any cell from the first row of unic?

Niels on 5 Oct 2017
Hi Carl Narup,
2. if you want to compare strings use strcmp
% here is 1 solution, i am not sure if you will understand it :/ with my test strings
MPcell1 = {'a', 'e', 'q', 't', 'w', 'q', 't', 'a', 'b', 'a'};
unic = {'a', 'q', 'w'};
-------------------------
function totsum = songsum(MPcell1, unic, c)
numb_artists = length(unic); % when adding a row to unic u get a matrix, using length can be confusing then
unic(2,:) = cell(1,numb_artists); % adding a row
for i = 1:numb_artists
unic{2,i} = sum(strcmp(MPcell1,unic{1,i}));
end
end
strcmp compares all elements of MPcell1 at once with each element of unic and returns a logical array (with 1 if true and 0 if false)
sum adds up all 1s to the total number of succesfull hits
But be careful, if you are not used to use logical operations on matrices the result (or further comparisons) might surprise you.