Hello,
I'm not sure how to make a plot of a norm that I found inside a function.
Here is my code, which will best help me explain:
clc; clear all;ti = 0; tf = 15; global I11 I22 I33 Mx My Mz w10 w20 w30 eps10 eps20 eps30 eps40 IC K0I11 = 160; I22 = 400;I33 = 400;Mx = 0;My = 0;Mz = 45;w10 = 2;w20 = -1;w30 = 1; eps10 = 0;eps20 = 0;eps30 = 0;eps40 = 1;K0 = eps10^2+eps20^2+eps30^2+eps40^2;IC = [w10 w20 w30 eps10 eps20 eps30 eps40];[t, y] = ode45(@(t,y) DynEqn1(t,y,I11,I22,I33,Mx,My,Mz), [ti tf], IC);figure (1)plot(t,y(:,1:3))figure (2)plot(t,y(:,4:7))figure (3)plot(t,(norm(y(:,4:7))-K0))function soln = DynEqn1(t,y,I11,I22,I33,Mx,My,Mz)w1 = y(1);w2 = y(2);w3 = y(3);eps1 = y(4);eps2 = y(5);eps3 = y(6);eps4 = y(7);disp(norm(y(4:7)))w1_dot = (Mx - w2*w3*(I33-I22))/I11;w2_dot = (My - w1*w3*(I11-I33))/I22;w3_dot = (Mz - w1*w2*(I22-I11))/I33;eps1_dot = .5*(w1*eps4-w2*eps3+w3*eps2);eps2_dot = .5*(w1*eps3+w2*eps4-w3*eps1);eps3_dot = .5*(-w1*eps2+w2*eps1+w3*eps4);eps4_dot = -.5*(w1*eps1+w2*eps2+w3*eps3);soln = [w1_dot; w2_dot; w3_dot; eps1_dot; eps2_dot; eps3_dot; eps4_dot];end
Basically, if I just display the norm from within the function, I get the values. But I would like to plot those values (minus a set value) versus time, but can't get it to work.
I tried defining the norm from within the function as a variable, K, but that didn't work either.
Any help is appreciated.
Thanks,
Jon
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