Coupled differential equation using ODE 45
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My program is attached. I am getting dwp0dz and dwp2dz zero. Please help.
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James Tursa
2021-5-11
Please delete the image and instead post your code as text highlighed by the code button. We can't copy & run pictures.
MAMTA SINGH
2021-5-11
采纳的回答
Jan
2021-5-11
Yes, of course the values are 0.
The initial value of y(1) is 0. The derivative of y(1) is:
dwp0dz = ((s * alpha0 * y(1) * x0)/w);
This is 0, when y(1) is 0. So the value remains at 0.
The same happens for y(2):
dwp2dz = x1 *((alpha0 * y(1) * xr ) + (alpha0 * y(2) * x0) + (alpha2 * y(1) * x0))
% == 0 == 0 ==0
If all terms are 0, the sum is 0 also.
This means, that the calculations do exactly, what is expected. Why do you think that you need help?
A hint: c = 2.997 * 10^10 is a multiplication and an expensive power operation, while c = 2.997E10 is a cheap constant.
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