How to convert logarithmic to linear

Question

Moza Mohamed 2021-9-20

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https://ww2.mathworks.cn/matlabcentral/answers/1456699-how-to-convert-logarithmic-to-linear

回答： Mark 2024-5-29

I use rfplot to plot magnitude of s-parameters in db, if i want to plot the s.parameters in linear form how can i do this ?

s=sparameters("C:\Users\Moza Salem Mohamed\OneDrive\Desktop\MM\Lab 2\emptyCell.s2p")
figure
rfplot(s,1,1)
hold on 
rfplot(s,2,1)
title("Empty Cavity (Log)")
hold off

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Answer 1

Mark 2024-5-29

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The default rfplot format is "db", but it also supports "abs", "angle", "real", and "imag".

For example, rfplot(s,1,1,"abs").

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Answer 2

KSSV 2021-9-20

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Take exp of the result. The inverse of log is exp,

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Answer 3

Star Strider 2021-9-20

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https://ww2.mathworks.cn/matlabcentral/answers/1456699-how-to-convert-logarithmic-to-linear#answer_791079

在 MATLAB Online 中打开

If you have the Signal Processing Toolbox, use the db2mag function.

If you do not have it:

dB2mag = @(dB) 10.^(dB/20);                                 % Note: Capital 'B'
mag = 100;
dB = mag2db(mag)
mag = dB2mag(dB)

Since MATLAB is case-sensitive, the ‘dB2mag’ anonymous function will not overshadow any of the db2mag functions in the Toolboxes. (The exp function will not work in this instance, since decibels are defined in terms of base-10 logarithms.)

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