can some1 plz help me to draw a curved line

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Masd 2014-1-14

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https://ww2.mathworks.cn/matlabcentral/answers/112345-can-some1-plz-help-me-to-draw-a-curved-line

评论： Image Analyst 2014-1-15

I need to make a graph for school. I need to make just the second line http://www.geofex.com/Article_Folders/potsecrets/pottaper.gif (2.logarithmic or audio taper)

i already made a linear line.. this is my program

ps. i have no idea how this program works.. we didnt learn it in school

Un=120%tension[V]
R=500%potentiometer[kOhm]
I=10%potentiometer[mm]
x=0:1:10;%dunno what this line is
Rx=(x/I)*R
U=Un*(Rx/R)
plot(x,U)
xlabel('potentiometer[mm]')
ylabel('tension[V]')

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Answer 1

mohammed 2014-1-14

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Dear Masd

for Drawing a curved line u just need change your equation by square. i.e U=Un(Rx/R).^2;

Un=120%tension[V]
R=500%potentiometer[kOhm]
I=10%potentiometer[mm]
x=0:1:10;%dunno what this line is
Rx=(x/I)*R
U=Un*(Rx/R).^2;
plot(x,U)
xlabel('potentiometer[mm]')
ylabel('tension[V]')

x=0:1:10;%dunno what this line is;

This equation indicates that the value of x is changing from 0 to 10 at a step of 1;i.e [0,1,2,3.....,10].

i hope it will help you.

Best Of Luck.....

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Masd 2014-1-14

编辑：Image Analyst 2014-1-15

Thank you :)

Can you tell me what .^2 means?

Image Analyst 2014-1-15

It means to square every element of the array. So if you had a square matrix M, M^2 is like [M][M] which is a matrix multiply (first row times first column and sum, etc.) while M.^2 means the M(1,1) element is squared, the M(1,2) element is squared, and so on. Totally different result than the matrix multiply.

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