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

3 views (last 30 days)
Lucas Lombao Pascual on 31 Oct 2022
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

RAGHUNATHRAJU DASHARATHA on 31 Oct 2022
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)
Lucas Lombao Pascual on 31 Oct 2022
You're right, thank you

Jon on 31 Oct 2022
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 on 31 Oct 2022
x = linspace(0.01,0.99,100); % Avoid tricky inputs like 1
y = 0.75./(log10(x)*2).^2;
plot(x,y)

Torsten on 31 Oct 2022
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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