not a polynomial error
11 views (last 30 days)
Show older comments
Hey Guys,
I've a problem with using command SymNum. It returns :
Error using sym/sym2poly (line 30)
Not a polynomial.
Error in blaab (line 148)
TFnum = sym2poly(symNum);
I'm trying to return a eigenvalue to polynomial value in order to take frequency response from eigenvalues.
here are my two eigenvalues and I found a " ^(1/2) " or sqrt in my eigenvalues and I'm sure bc of sqrt I become this error but does anyone know how shoud I solve this problem??
d =
(1000*(300*(915166350000000000000000000000000000*s + 92091374302500000000000000000000000*s^2 + 4050759037830375000000000000000000*s^3 + 85294453297221250000000000000000*s^4 + 839426647542151875000000000000*s^5 + 3201446226471423890625000000*s^6 + 1160530083851214375000000*s^7 + 274295745577856250000*s^8 + 31391692074000000*s^9 + 2318919840000*s^10 + 78804495000000000000000000000*s^3*pi^2 + 8046264822750000000000000000*s^4*pi^2 + 152665574748412500000000000*s^5*pi^2 + 1038770004137420625000000*s^6*pi^2 + 2546901356286937500000*s^7*pi^2 - 3274156852736625625*s^8*pi^2 - 2383290277254600*s^9*pi^2 - 552158796114*s^10*pi^2 - 54962280*s^11*pi^2 - 2025*s^12*pi^2 + 3223820250000000000000000000000000000)^(1/2) - 50121000000000000000*s - 1276263150000000000*s^2 - 7471084987500000*s^3 + 31693412750000*s^4 + 10773802575*s^5 + 1832076*s^6 + 135*s^7 - 538650000000000000000))/(1013760000000000000000000*s + 21237684000000000000000*s^2 + 165999060600000000000*s^3 + 566102834000000000*s^4 + 204318183000000*s^5 + 48091927725*s^6 + 5496228*s^7 + 405*s^8 + 3950100000000000000*s^2*pi^2 + 43953030000000000*s^3*pi^2 + 192919277250000*s^4*pi^2 + 54962280000*s^5*pi^2 + 4050000*s^6*pi^2 + 15800400000000000000000000)
-(1000*(50121000000000000000*s + 300*(915166350000000000000000000000000000*s + 92091374302500000000000000000000000*s^2 + 4050759037830375000000000000000000*s^3 + 85294453297221250000000000000000*s^4 + 839426647542151875000000000000*s^5 + 3201446226471423890625000000*s^6 + 1160530083851214375000000*s^7 + 274295745577856250000*s^8 + 31391692074000000*s^9 + 2318919840000*s^10 + 78804495000000000000000000000*s^3*pi^2 + 8046264822750000000000000000*s^4*pi^2 + 152665574748412500000000000*s^5*pi^2 + 1038770004137420625000000*s^6*pi^2 + 2546901356286937500000*s^7*pi^2 - 3274156852736625625*s^8*pi^2 - 2383290277254600*s^9*pi^2 - 552158796114*s^10*pi^2 - 54962280*s^11*pi^2 - 2025*s^12*pi^2 + 3223820250000000000000000000000000000)^(1/2) + 1276263150000000000*s^2 + 7471084987500000*s^3 - 31693412750000*s^4 - 10773802575*s^5 - 1832076*s^6 - 135*s^7 + 538650000000000000000))/(1013760000000000000000000*s + 21237684000000000000000*s^2 + 165999060600000000000*s^3 + 566102834000000000*s^4 + 204318183000000*s^5 + 48091927725*s^6 + 5496228*s^7 + 405*s^8 + 3950100000000000000*s^2*pi^2 + 43953030000000000*s^3*pi^2 + 192919277250000*s^4*pi^2 + 54962280000*s^5*pi^2 + 4050000*s^6*pi^2 + 15800400000000000000000000)
thx.
1 Comment
Answers (0)
See Also
Categories
Find more on Code Generation in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!