duplications for building array of integers or array of chars

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Mohamed Jamal
Mohamed Jamal 2020-7-15
评论： Mohamed Jamal 2020-7-15
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 !
  1 个评论
madhan ravi
madhan ravi 2020-7-15
编辑：madhan ravi 2020-7-15
What did you try for your homework? You need to first know the difference between string and character array first.

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回答（1 个）

madhan ravi
madhan ravi 2020-7-15
y >= 1
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Mohamed Jamal
Mohamed Jamal 2020-7-15
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
Mohamed Jamal 2020-7-15
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!
appreciated for your explanation!

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