"V = V.';" What Does This Syntax Mean?

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Michael Cappello 2020-3-4

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https://ww2.mathworks.cn/matlabcentral/answers/509068-v-v-what-does-this-syntax-mean

编辑： Stephen23 2020-3-4

采纳的回答： Stephen23

The Matlab function interp2 is sprinkled with the following "V.'". For example, lines 194:196 in 2019a is

X = X.':

Y = Y.';

Z = Z.';

Why is the "." before the transpose. What does it accomplish? I've never seen this syntax before. And it doesn't seem to accomplish anything because if I let

X = rand(3,5)

then isequal(X.',X') is indeed equal.

Thanks in advance!

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Answer 1

Stephen23 2020-3-4

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https://ww2.mathworks.cn/matlabcentral/answers/509068-v-v-what-does-this-syntax-mean#answer_418564

编辑：Stephen23 2020-3-4

The difference is:

Several basic numeric operations have two versions, one for linear algebra (without the dot) and one for element-wise operations (with a dot). If you are not doing linear algebra then you should be using array operations (yes, this includes transpose rather than ctranspose). Read more here:

https://www.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html

"I've never seen this syntax before."

Understanding the difference between array and matrix operations is an important step to learning MATLAB.

"And it doesn't seem to accomplish anything"

Try it on some arrays with complex numbers in them.

Note that both the ctranspose or transpose pages include at the bottom: