How to do the following matrix multiplication and division?

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Ahmed Razeen 2020-8-12

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https://ww2.mathworks.cn/matlabcentral/answers/578634-how-to-do-the-following-matrix-multiplication-and-division

评论： jessupj 2020-8-12

I have Frequency as a 22x1 column vector, and the following equation must produce 22x1 column vector [all other variables are scalars]

Lorentz_Imaginary_conductivity = DC_Conductivity * ((time * Frequency .* (1 - Oscillator_frequency^2 / Frequency.^2)) ... 
    ./ (1 + (time .* Frequency .* (1 - Oscillator_frequency^2 ./ Frequency.^2)).^2));

But instead it gives 22x22 matrix. What is the problem here?

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jessupj 2020-8-12

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https://ww2.mathworks.cn/matlabcentral/answers/578634-how-to-do-the-following-matrix-multiplication-and-division#answer_478728

在 MATLAB Online 中打开

(1 - Oscillator_frequency^2 / Frequency.^2))

this slash needs to be a './' or it's interpreted as a matrix inverison... htat's where your 22x22 is coming from

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Ahmed Razeen 2020-8-12

Yea, That worked. Thank you very much

jessupj 2020-8-12

my bad for being sloppy. this is not technically a matrix inversion of course. most control/inverse problem folks that i know conisider 'scalar divided by a vector' an inverison (e.g. of a moment), at least conceputally.

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