How to use the logspace function to create a vector of frequencies in Hz and not rad/s

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Shikhar Singh 2021-10-26

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https://ww2.mathworks.cn/matlabcentral/answers/1572008-how-to-use-the-logspace-function-to-create-a-vector-of-frequencies-in-hz-and-not-rad-s

回答： Dave B 2021-10-26

Given frequencies f1 and f2, low and high respectively, in Hz, how can I use the logspace function to create a vector of frequencies in Hz?

If f1 is 0.087Hz and f2 is 20Hz, creating a vector:

A = logspace(1,2)

would be incorrect as logspace takes in inputs as rad/s, how can i use logspace using the same values in Hz?

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Answer 1

Dave B 2021-10-26

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1572008-how-to-use-the-logspace-function-to-create-a-vector-of-frequencies-in-hz-and-not-rad-s#answer_816913

在 MATLAB Online 中打开

To get logarithmically spaced values between 0.087 and 20:

logspace(log10(.087), log10(20))
ans = 1×50
    0.0870    0.0972    0.1086    0.1214    0.1356    0.1515    0.1693    0.1892    0.2114    0.2362    0.2639    0.2949    0.3295    0.3682    0.4114    0.4597    0.5136    0.5739    0.6412    0.7165    0.8006    0.8945    0.9995    1.1168    1.2479    1.3943    1.5580    1.7408    1.9452    2.1734

To be clear, logspace doesn't take inputs in rad/s or Hz, it just takes values. But it expects exponents that 10 would be raised to, and so you can use log10 to convert your values.