how to use Subscript in for loop

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reza hamzeh
reza hamzeh 2019-10-20
回答： Dimitris Kalogiros 2019-10-20
hi.
i have some mathematica codes that i want to change them to matlab codes. i think its possible to write these codes as two for-loops in matlab. but unfortunetly
i dont know how to do that. in mathematica its easy to do that with help of Subscripts but there is no Subscript in matlab to do that.
tr=trace
codes.jpg
the code should be something like this ?? plz help me
for i=0:3
for j=0:3
p{i,j}=trace(e{i}*ro)*trace(e{j}*ro)
end
end
  1 个评论
Star Strider
Star Strider 2019-10-20
You need to start the indices with 1 instead of 0, since MATLAB subscripts are defined as integers greater than 0.
Otherwise, it appears to be correct, assuming that the elements of cell array ‘e’ are square matrices.

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回答（1 个）

Dimitris Kalogiros
Dimitris Kalogiros 2019-10-20
What is Tr [ ] at your mathematica code ? Is it an array or a function (I am asking because I 've no experience on mathematica).
You must be aware of the fact that indexes in matlab starts from 1 . For example if A is a vector of 5 elements, then A(1) is is the first element. On the other hand A(0) , produces an execution error.
So, the matlab code you suggest has to be corrected in one or two places:
  • i and j indexes must have a range from 1 to 4
  • depending on the value of e{i}*ro or e{j}*ro, maybe you have to add +1, when you use them as indexes.

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