Plotting (1-2*x)*log((1-x)/x)
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Hello!. I am very new to matlab and wanna know how can I plot
y=(1-2*x)*log((1-x)/x) function?
I tried to write it like that but it did not work as i expected.. It plots something else..
thanks..
and also why i cannot plot (1/x)? thanks.
2 commentaires
Geoff Hayes
le 8 Mar 2015
Kemal - what is the code that you are using to plot your above y? What have you initialized x as?
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Giorgos Papakonstantinou
le 8 Mar 2015
Modifié(e) : Giorgos Papakonstantinou
le 8 Mar 2015
The problem occurs inside the log parenthesis. The syntax that you have used tells Matlab to solve the equation:
x = B/A
If you want to do element-wise arithmetic operations (division, power, etc.) then you have to use . before each operation. Look for more information here.
In your case you have to modify your equation:
y=(1-2.*x).*log((1-x)./x)
Here the log function computes the natural logarithm.
or
y=(1-2.*x).*log10((1-x)./x)
Here the log10 function computes the logarithm when the base is 10
For example if:
x=0:0.02:1;
y=(1-2*x).*log((1-x)./x) ;
plot(x,y)
the result is:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/173735/image.jpeg)
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