Creating array from 1.e-20 to 1, with steps 1.e-19, 1.e-18..

Question

Gina DiCarlo 2016-9-15

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https://ww2.mathworks.cn/matlabcentral/answers/303189-creating-array-from-1-e-20-to-1-with-steps-1-e-19-1-e-18

编辑： John D'Errico 2016-9-15

The only command I know to control the steps is when you use the : operator, however the step is too small (0.e+01) and it gives me an error of a 1 by 0 matrix.

Not sure what to use here, I have tried linspace and logspace but none seem to be of help.

Thanks!

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Answer 1

Peter Cook 2016-9-15

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https://ww2.mathworks.cn/matlabcentral/answers/303189-creating-array-from-1-e-20-to-1-with-steps-1-e-19-1-e-18#answer_234892

logspace(-20,0,21)

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Gina DiCarlo 2016-9-15

Thank you! After looking at the help selection on logspace I had a serious face palm moment

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Answer 2

John D'Errico 2016-9-15

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https://ww2.mathworks.cn/matlabcentral/answers/303189-creating-array-from-1-e-20-to-1-with-steps-1-e-19-1-e-18#answer_234893

编辑：John D'Errico 2016-9-15

在 MATLAB Online 中打开

As Peter points out, logspace is the way to do this. (In fact, I up-voted his answer.) In general, use existing tools where you can. This minimizes the odds of any problems, makes your code easy to read and debug, etc. But you don't need to use it. For those who might want to see a simple alternative, this will suffice:

v = 10.^(-20:0);