Stop the Inf numbers

Question

Jonathan Stanton 2020-3-12

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/510519-stop-the-inf-numbers

编辑： John D'Errico 2020-3-12

Hi all,

have this bit of code that reads:

function R = resistors()
	
     r = transpose(100:100:400);%transpose to column vector
     
     R = 1./((1/r)); % (.) makes the vector even
end

and its results read;

>> resistors
ans =
   Inf   Inf   Inf   400

i want to stop or not have the Inf, but the real numbers, can someone point me in the right direction? need it for an assesment.

Thanks

Jon

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Jonathan Stanton 2020-3-12

cheers, works lovely!!

Stephen23 2020-3-12

"1/(1/r) Is the same as just r"

This is totally incorrect.

How is solving systems of linear equations anything like calculating the inverse?

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Answer 1

Stephen23 2020-3-12

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/510519-stop-the-inf-numbers#answer_419818

编辑：Stephen23 2020-3-12

You used the wrong operator: mrdivide / solves a system of linear equations.

You need to learn the differrences between matrix operations and array operations, otherwise all of your MATLAB code will produce meaningless rubbish outputs:

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

Use rdivide ./

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John D'Errico 2020-3-12

编辑：John D'Errico 2020-3-12

In my hoped for new post as official WhiteHouse MATLAB counsel, I will recommend that infs and NaNs be forever outlawed. They only confuse people anyway. I might even try to require that pi==3, as this would make many computations much simpler for children in school. By the way, the Earth will soon be mandated to be flat, if I get my way.

My campaign is beginning today. Please get your write-in votes in as soon as possible!