How can i plot this function? y=0.75/(log10(x)*2).^2

2022 10 31
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更新时间：2022 10 31
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Hi, ive been trying differents ways of plotting fuctions such as log, implicit... but i cant manage to plot in 2D the next function in matlab
y= 0.75/(log10(x)*2).^2

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Ran in:

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Ran in:
As per my understanding you want to plot the given function in 2D plot .
It is just that you forgot to add '.' before '/' to do element wise operation.I will explain it with the example below
x=2:10;
y= 0.75./(log10(x)*2).^2
y = 1×9
2.0691 0.8237 0.5173 0.3838 0.3097 0.2625 0.2299 0.2059 0.1875
plot(x,y)

更多回答（3 个）

Jon
Jon 2022-10-31
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0 个投票

Ran in:
Something like this?
x = linspace(1,10); % or whatever interval you would like change accordingly
y = 0.75 ./(log10(x).^2).^2 % note .^ for element wise power on log10(x)
y = 1×100
1.0e+05 * Inf 3.6781 0.2707 0.0623 0.0228 0.0107 0.0059 0.0036 0.0024 0.0017 0.0012 0.0009 0.0007 0.0006 0.0005 0.0004 0.0003 0.0003 0.0002 0.0002 0.0002 0.0002 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001
figure
plot(x,y)
% Or maybe you want the final power of 2 apply to the numerator and the
% denominator?
y = (0.75 ./(log10(x).^2)).^2
y = 1×100
1.0e+05 * Inf 2.7586 0.2030 0.0467 0.0171 0.0080 0.0044 0.0027 0.0018 0.0012 0.0009 0.0007 0.0005 0.0004 0.0003 0.0003 0.0002 0.0002 0.0002 0.0002 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001
plot(x,y)
Mike Croucher
Mike Croucher 2022-10-31
Ran in:

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Ran in:
How about this?
x = linspace(0.01,0.99,100); % Avoid tricky inputs like 1
y = 0.75./(log10(x)*2).^2;
plot(x,y)
Torsten
Torsten 2022-10-31
Ran in:

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Ran in:
What do you mean by "in 2D" ? It is a simple function to be plotted y vs. x:
x = 2:0.01:5;
y = 0.75./(log10(x)*2).^2;
plot(x,y)

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