solving symbolic array to output a numerical solution

2 ビュー (過去 30 日間)
Samuel Casallas
Samuel Casallas 2021 年 3 月 26 日
編集済み: VBBV 2023 年 6 月 1 日
Hi there, I was wondering if I could get some feedback on a potential solution for this problem. I am trying to solve for ma3 and obtain a numerical value for each value used in the FLcD3 array. However, the output of Ma3 is a struct with fields. How do I get it so the solution is an array with the numerical values? I'm guessing I would need some form of a for loop but i'm not quite sure how to set it up.
PSW = 0.36:0.03:0.69;
L12 = PSW*TL;
D = 0.03;
Ma4 = 1;
P4 = 1.013;
Lc3 = TL-L12;
FLcD3 = 4*f*Lc3/D;
ma3 = sym('ma3', [1 length(PSW)]) ;
eqn1 = (-1./G).*(1-ma3.^-2)+((G+1)./(2.*G)).*log((((G+1)./2).*ma3.^2)./(1+((G-1)./2).*ma3.^2)) == FLcD3;
Ma3 = vpasolve(eqn1,ma3)
%This is the output I get
Ma3 =
ma31: [1×1 sym]
ma32: [1×1 sym]
ma33: [1×1 sym]
ma34: [1×1 sym]
ma35: [1×1 sym]
ma36: [1×1 sym]
ma37: [1×1 sym]
ma38: [1×1 sym]
ma39: [1×1 sym]
ma310: [1×1 sym]
ma311: [1×1 sym]
ma312: [1×1 sym]

回答 (2 件)

madhan ravi
madhan ravi 2021 年 3 月 26 日
編集済み: madhan ravi 2021 年 3 月 26 日
  2 件のコメント
Samuel Casallas
Samuel Casallas 2021 年 3 月 26 日
I had previously tried that but I get the error:
Unrecognized function or variable 'struct2array'.
Is there a work around this?


VBBV 2023 年 6 月 1 日
編集済み: VBBV 2023 年 6 月 1 日
From the reference link given by @madhan ravi, you can use struct2cell function and later convert the cell to double array using cell2mat function. And i think both struct2cell & cell2mat are documented well in Matlab
Ma3 = vpasolve(eqn1,ma3)


Help Center および File ExchangeConversion Between Symbolic and Numeric についてさらに検索

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by