What is the meaning of p(1, :) in the following lines?

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mathru 2020-8-27

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评论： Stephen23 2020-8-27

p = thermalModelT.Mesh.Nodes;
nodesLeftEnd  = find(p(1,:) < -1.5+eps);
nodeCenter = nodesLeftEnd(p(2,nodesLeftEnd) < eps);
nodeOuter = nodesLeftEnd(p(2,nodesLeftEnd) > 0.2-eps);

In the above lines, what does it mean by p(1,:) and p(2,nodesLeftEnd)?

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Stephen23 2020-8-27

"what does it mean by p(1,:) and p(2,nodesLeftEnd)?"

Very basic MATLAB concepts, such as indexing into arrays, is explained in the introductory tutorials:

https://www.mathworks.com/help/matlab/getting-started-with-matlab.html

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Answer 1

Alan Stevens 2020-8-27

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It refers to the first row and all columns of matrix p.

So find(p(1,:) < -1.5+eps); means look through all the columns of the first row of p and find which ones satisfy the condition that they are less than -1.5+eps.