i want 3D plot of the following equation iin matlab.buh it keep on giving errors.?

I want 3D plot of the following equation iin matlab.buh it keep on giving errors.?

exp(t*i) - (192*exp(t*i)*(2*t^5*i + 5*t^4 + 4*t^3*x^2*i + t^3*i + 6*t^2*x^2 + (9*t^2)/2 + 2*t*x^4*i - 3*t*x^2*i - (15*t*i)/8 + x^4 + (3*x^2)/2 - 3/16))/(64*t^6 + 192*t^4*x^2 + 432*t^4 + 192*t^2*x^4 - 288*t^2*x^2 + 396*t^2 + 64*x^6 + 48*x^4 + 108*x^2 + 9);

[KSSV]

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Answer 1

[Walter Roberson]

If you are expecting a 3d plot then at least one of your variables must be a vector or an array. To handle those you need to vectorize your code. Replace every * with .* and replace every ^ with .^

[Heya :)]

thanyou walter.i am goona try it.

[Heya :)]

syms  x t f;
syms r2;
r2=exp(t.*i) - (192.*exp(t.*i)*(2.*t.^5.*i + 5.*t.^4 + 4.*t.^3.*x.^2.*i + t.^3.*i + 6.*t.^2.*x.^2 + (9.*t.^2)/2 + 2.*t.*x.^4.*i - 3.*t.*x.^2.*i - (15.*t.*i)/8 + x.^4 + (3.*x.^2)/2 - 3/16))/(64.*t^.6 + 192.*t.^4.*x.^2 + 432.*t.^4 + 192.*t.^2.*x.^4 - 288.*t.^2.*x.^2 + 396.*t.^2 + 64.*x.^6 + 48.*x.^4 + 108.*x.^2 + 9);
ezsurf(r2,[2 5 -5 20])
zlim([0 1.8])

[Heya :)]

[Heya :)]

graph of this equation is like this bu i am getting nothing :(

[Walter Roberson]

Your expression appears to be everywhere complex over real x and t.

Note: you should be more careful about which variable is the "first" variable for plotting purpose. You would be better off creating a symbolic function, or use matlabFunction with the 'vars' option to specifically indicate the order of the variables.

Correction: checking further, I see that there are points where the imaginary component goes to zero, located approximately pi apart on the t axis. So there might be lines of x values where the values exist. Certainly not a surface.