how do i solve plot error

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grace lim
grace lim 2022-3-5
评论： Walter Roberson 2022-3-5
i faced this error in plotting pls help
i want to subs f=100.200,300 how do i do that?
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grace lim
grace lim 2022-3-5
yes i have syms those symbols as im using symbols in this case
Walter Roberson
Walter Roberson 2022-3-5
Suppose you have the code
A = 3
B = A * 4
A = 5
What is the value of B afterwards? Does B start evaluating to 20 on the basis that B is a formula in A and "should" update every time A updates? If so then consider
A = 3
B = A * 4
A = B + 1
If the variables remember their formulas then it follows that
A == B + 1
A == 4*A + 1
0 == 3*A + 1
A == -1/3
B == 4*A
B == -4/3
So if variables remember their formulas and adjust as the defining variables change then it follows from the formulas that the relationship between the formulas requires that A = -1/3 and B = -4/3. But! We defined A = 3 remember! Deduction from the formulas as the variables update has arrived at a contradiction!
If we had done something like
A = 3
B = A - 1
A = B - 1
then the two formula imply that B = B - 2 which implies 0 = - 2 (impossible) or implies B is infinite
Is this a sustainable interpretation of the meaning of what happens if you update a variable after it has been used? No.
And so when you define H in terms of w and then you change w, you should not be expecting H to suddenly change to the new definition of w.
You should be defining w (in terms of f) before you use w (in H)

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