# For each loop upon fixed size array

조회 수: 1(최근 30일)
Jimmy cho 16 Nov 2020
댓글: Jimmy cho 16 Nov 2020
Hi guys,
I have three variable x y z that are integer values and for instance its values are :
x=5 , y=2 , z=3;
and I have an array called A equal to A=[x y z]
I want to do for each loop upon the array A and adding +1 for every iteration of the for each loop .
I came from world of c world and rarely I use matlab (it depends on what do I want to implement ) .. how can I do that in matlab?
thanks alot for any help .

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### 채택된 답변

David Hill 16 Nov 2020
for k=1:100
A=A+1;
end

#### 댓글 수: 4

표시 이전 댓글 수: 1
Image Analyst 16 Nov 2020
Why by a for loop instead of by using the diff() or conv2() function?
Jimmy cho 16 Nov 2020
Can't I do that in matlab? for instance in python ..and the reason is that foreach it's more elegant that using idexes.
another question in the context, lets assume I have array A=[x y z ] and x , y , z as I said in my thread above is integer values, how I pass/run over A array by foreach in matlab code?
just like this:
for m:A
%do something with m / do arithmatic with m , m is the value of array A and next value of array A updated to m at each iteration
end
Image Analyst 16 Nov 2020
Well most MATLABers would think
result = diff(A) > 0;
is more elegant than using for or foreach. The diff() function subtracts the kth element from the (k+1)st element.
result is a logical matrix giving essentially a "map" of what elements are greater than the prior element.

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### 추가 답변(1개)

Image Analyst 16 Nov 2020
Another option
Acopy = A; % Make copy of original
for k = 1 : 100
Acopy = A + k;
end
The original A does not get changed, however Acopy still gets overwritten at each iteration.

#### 댓글 수: 2

Jimmy cho 16 Nov 2020
" Acopy = A + k " in this statement the A is changed at every iteration to the next value organizedly ? I mean first value at 1, then next iteration value at 2 , then next iteration value at 3 ?
Jimmy cho 16 Nov 2020
If I understand you well, if I do this:
for k = 1 : 100
m = A ;
end
so every value of A will be copied / stored to m correspondingly , yes?
Implicitly A is going to the next value at every iteration

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