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logspace with gap of half

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Megha
Megha on 6 Jan 2019
Commented: Megha on 6 Jan 2019
yt = logspace(-3,4,8);
This gives 0.001, 0.01, 0.1,1,10,100,1000,10000
However, I want
0.001, 0.005, 0.01,0.05, 0.1, 0.5, 1,5, 10,50, 100,500, 1000,5000, 10000
How Can i get that?
Can anyone help?

Accepted Answer

Stephen23
Stephen23 on 6 Jan 2019
Edited: Stephen23 on 6 Jan 2019
>> V = logspace(-3,4,8);
>> V = [V;5*V];
>> V = V(1:end-1)
V =
0.001 0.005 0.010 0.050 0.100 0.500 1.000 5.000 10.000 50.000 100.000 500.000 1000.000 5000.000 10000.000
Note that the values you requested are not evenly spaced in log-space (because the power difference between adjacent values alternates between ~0.30103 and ~0.69897). Evenly spaced values would simply be:
>> V = logspace(-3,4,15)
0.0010000 0.0031623 0.0100000 0.0316228 0.1000000 0.3162278 1.0000000 3.1622777 10.0000000 31.6227766 100.0000000 316.2277660 1000.0000000 3162.2776602 10000.0000000
where the difference in powers between adjacent values is always exactly 0.5.

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