For each loop upon fixed size array

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Jimmy cho 2020-11-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/649443-for-each-loop-upon-fixed-size-array

评论： Jimmy cho 2020-11-16

采纳的回答： David Hill

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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Answer 1

David Hill 2020-11-16

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for k=1:100
    A=A+1;
end

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Jimmy cho 2020-11-16

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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 2020-11-16

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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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Answer 2

Image Analyst 2020-11-16

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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.

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Jimmy cho 2020-11-16

" 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 2020-11-16