# duplications for building array of integers or array of chars

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Mohamed Jamal on 15 Jul 2020
Commented: Mohamed Jamal on 15 Jul 2020
Hi guys, I have a problem and it would be pleasure for your assistance.
I have array called y=[5 -1 6 7 9 0 7 3 -4 -4 6];
another array of integers called occurences[1 2 3 4 5 6 7 8 9 10 11]
what I want to implement in matlab is this to loop over array occurences and check at every i if y(i)>0 then I put value 1 in another array/string according to its replications occurences in array occurences at index i, and if y(i) is negative or zero then I put the value 0 according to its occurences in array occurences at index i, for example
y(i=1) >0 because 5>0 then I go to the same index i on the array occurences and check at the same index i=1 how many times should I put "1" in another array of integers or array of chars.
y(i=2) <0 because -1<0 then I go to the same index i on the array occurences and check at the same index i=2 how many times should I put "0" in another array of integers or array of chars.
the output is array of integers or array of chars that must look like [1 0 0 1 1 1 1 1 1 1 ...etc] , the outputs must be values of zero and ones that are accordingly concatenated to number of occurences at index i .
the output is an array could be integers like [1 0 0 1 1 1 1 1 1 1 ...etc] or array of chars like: '1001111111 .....' (doesn't matter which one!)
thanks alot
thanks alot !
madhan ravi on 15 Jul 2020
Edited: madhan ravi on 15 Jul 2020
What did you try for your homework? You need to first know the difference between string and character array first.

madhan ravi on 15 Jul 2020
y >= 1
Mohamed Jamal on 15 Jul 2020
Hi! first I appreciate your effort, and really appreciated!
in your example code, could you tell me where is your occurance array? once again occurance arrray could be like this occurance=[100 10 1 2 1 90] not exactly [1 2 3 4 5 6 7 8 .. ]
thank for your assistance, my problem is that where is the occurence (replication) array in your code? thanks alot!
Mohamed Jamal on 15 Jul 2020
could you please explain those matlab code lines:
ix = 1:numel(y);
y1 = +(y >= 1);
Output = repelem(y1, ix)
what does ix=1:numel(y) gives me array or what? it sounds that every time ix takes a number from range 1:numberl(y) and then assign it to ix no? and what does +(y>=1) mean? exaclty the syntaxt + what it does to my condition y>=1? thanks alot
Yes I'm still not totally mastered in matlab, still need to master and learn more the matlab syntax!

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