Create a diagram with 3 polynomials

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Berkay 2022-8-30

评论： Star Strider 2022-8-30

I have defined 3 polynomials

P1 = [ 1 -2 -15]

P2 = [1 -7 12]

P3 = [1 1 -14 -24]

I want to generate a graph that will present the shape of all polynomials in range from -100 to 100 with specific description(the logarithmic axes)

How can I do it?

Star Strider 2022-8-30

I am not certain wht you want with ‘logarithmic axes’ so this creates both as logarithmic —

P1 = [ 1 -2 -15];

P2 = [1 -7 12];

P3 = [1 1 -14 -24];

x = linspace(-100, 100, 250);

V1 = polyval(P1,x);

V2 = polyval(P2,x);

V3 = polyval(P3,x);

figure

plot(x, [V1;V2;V3])

Ax = gca;

Ax.XScale = 'log'; % Logarithmic X-Axis

Ax.YScale = 'log'; % Logarithmic Y-Axis

grid

Warning: Negative data ignored

It may be best to only have the x-axis be logarithmic, and if so, consider using logspace instead of linspace.

Berkay 2022-8-30

thanks a lot man!!

Star Strider 2022-8-30

As always, my pleasure!

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