Problem while attaining the coefficent of variable

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inzamam shoukat
inzamam shoukat on 24 Mar 2024
Commented: Star Strider on 24 Mar 2024
IVW =
1440000*a2*a2s + 12960000*a2*a3s + 12960000*a3*a2s + 103680000*a2*a4s + 155520000*a3*a3s + 103680000*a4*a2s + 777600000*a2*a5s + 1399680000*a3*a4s + 1399680000*a4*a3s + 777600000*a5*a2s + 5598720000*a2*a6s + 11197440000*a3*a5s + 13436928000*a4*a4s + 11197440000*a5*a3s + 5598720000*a6*a2s + 83980800000*a3*a6s + 111974400000*a4*a5s + 111974400000*a5*a4s + 83980800000*a6*a3s + (6046617600000*a4*a6s)/7 + (6718464000000*a5*a5s)/7 + (6046617600000*a6*a4s)/7 + 7558272000000*a5*a6s + 7558272000000*a6*a5s + 60466176000000*a6*a6s
I used fallowing command
Eq_01 =coeffs(IVW ,a2s)
the answer i got from above command is as fallow:
[12960000*a2*a3s + 103680000*a2*a4s + 155520000*a3*a3s + 777600000*a2*a5s + 1399680000*a3*a4s + 1399680000*a4*a3s + 5598720000*a2*a6s + 11197440000*a3*a5s + 13436928000*a4*a4s + 11197440000*a5*a3s + 83980800000*a3*a6s + 111974400000*a4*a5s + 111974400000*a5*a4s + 83980800000*a6*a3s + (6046617600000*a4*a6s)/7 + (6718464000000*a5*a5s)/7 + (6046617600000*a6*a4s)/7 + 7558272000000*a5*a6s + 7558272000000*a6*a5s + 60466176000000*a6*a6s, 1440000*a2 + 12960000*a3 + 103680000*a4 + 777600000*a5 + 5598720000*a6]
My required answer as fallow
1440000*a2 + 12960000*a3 + 103680000*a4 + 777600000*a5 +5598720000*a6

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Accepted Answer

Star Strider
Star Strider on 24 Mar 2024
Ran in:
You need to specify more terms in your coeffs call. The problem is that then the polynomial separates into two separate polynomials. It is not obvious to me where that originates. In any event, ‘Eq_01(1)’ appears to be the result you want.
Try this —
syms a2 a3 a4 a5 a6 a2s a3s a4s a5s a6s
IVW = 1440000*a2*a2s + 12960000*a2*a3s + 12960000*a3*a2s + 103680000*a2*a4s + 155520000*a3*a3s + 103680000*a4*a2s + 777600000*a2*a5s + 1399680000*a3*a4s + 1399680000*a4*a3s + 777600000*a5*a2s + 5598720000*a2*a6s + 11197440000*a3*a5s + 13436928000*a4*a4s + 11197440000*a5*a3s + 5598720000*a6*a2s + 83980800000*a3*a6s + 111974400000*a4*a5s + 111974400000*a5*a4s + 83980800000*a6*a3s + (6046617600000*a4*a6s)/7 + (6718464000000*a5*a5s)/7 + (6046617600000*a6*a4s)/7 + 7558272000000*a5*a6s + 7558272000000*a6*a5s + 60466176000000*a6*a6s
IVW = 
[Eq_01, T] =coeffs(IVW , [a2s a3s a4s])
Eq_01 = 
T = 
Eq_01(1)
ans = 
Eq_01(2)
ans = 
.

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