How do you create an array around a central value?

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PR 2015-4-6

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https://ww2.mathworks.cn/matlabcentral/answers/196393-how-do-you-create-an-array-around-a-central-value

评论： Star Strider 2015-4-6

采纳的回答： Star Strider

I would like to write a function such as:

function [ array ] = generate_array( center_pt, resolution )

NB_POINTS = 5;

(...)

end

so that calling [ array ] = generate_array( 5, 2.5 )

array = [0 2.5 5 7.5 10]

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Star Strider 2015-4-6

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How about this? It has three arguments, since I don’t know if you want the number of points to be an argument or decided by the function.

NrPts = 5;
CtrPt = 5;
Res   = 2.5;
generate_array = @(CtrPt,NrPts,Res) linspace(CtrPt-Res*fix(NrPts/2), CtrPt+Res*fix(NrPts/2), NrPts);

It generates the array you specified, and seems to be robust for other argument values.

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PR 2015-4-6

Wow, ok! I can see now that linspace is the path of least resistance.

Everything remains contained in one line of code.

I have learned a great deal from your reply.

Many thanks

Star Strider 2015-4-6

My pleasure! I very much appreciate your compliment.

In Answers, we (collectively) strive to post the most efficient and fastest code, assuming that is what the person who posts the Question wants. Most of us also provide links to the relevant documentation, as well as a brief explanation of how the code we post works, using comments on each line or a short narrative description.

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