Can x、y、z、Y、b and c be derived by constant letters by matlab？

Can x、y、z、Y、b and c be derived by constant letters by matlab？

x、y、z 、、b and c are unknowns. e、f and g are constant value. So, the value（of e、f and g ） doesn't change. are the derivative of x y z b c with respect to time. Can x、y、z、Y、b and c be derived by constant letters by matlab？That is, Can x、y、z、Y、b and c will be denoted by e、f and g by matlab?

Answer 1

[Roger Stafford]

Your question is a rather perplexing one. Variables in matlab can be indicated by any letters. However, you cannot use the same symbols for different variables. That is, the e, f, and g symbols cannot also be used at the same time in place of the names of the variables x, y, z, etc. I have the impression that you haven't actually expressed the question you really have in mind. Can you try and reword it so that it is better understandable?

As to the equations as they stand, you should substitute

   b*c+y*z+e*f+e*g

for Y in the equation for db/dt. That will give you five first order differential equations in x, y ,z, b, and c which can be solved using one of the 'ode' solvers. After this, you can evaluate Y from the above expression.

[Lan]

e f g is constant， just like the Arabic numeral（1 2 3 4 5 6 7 8 9.....）。 e f g are change frequently. So I don't assign values to e f g in the equations。