# how i can write this in matlab

조회 수: 1(최근 30일)
Serafim Galinschii 2020년 12월 16일
댓글: Jan 2020년 12월 17일
##### 댓글 수: 1표시숨기기 없음
Jan 2020년 12월 17일
Do you want some code to evaluatre this expression? Then what is i and j?
Or do you want to write this as a lable or title of a diagram and ask for bold font, italics and the dot?

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### 답변(2개)

Matt Gaidica 2020년 12월 17일
i - 1.3 * diff(y) * j
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Walter Roberson 2020년 12월 17일
Probably not. and are usually used to represent unit vectors.

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Walter Roberson 2020년 12월 17일
That is a bit ambiguous, but most likely the MATLAB for that would be
-1.3j * diff(y)
You might notice that this has no i in it. It is likely that you should not use
i - 1.3j * diff(y) %PROBABLY WRONG
In the image you show, i and j are most likely unit vectors along two axes (that are usually mapped to x and y) . MATLAB does not have distinct unit vectors in multiple dimensions, just real values and imaginary values . MATLAB uses both i and j to represent the same value, sqrt(-1), so (for example) 1*i - 1*j would be 1*sqrt(-1) - 1*sqrt(-1) which would be 0.
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Also, watch out for predefined i and j variables which are common variable names in loops. That can be fixed by including
clear i j
if you're running this in a script.

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R2020a

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