Symbols to numeric values

Question

jack london 2022-1-18

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1630945-symbols-to-numeric-values

评论： jack london 2022-1-18

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

Hi everyone,

I have two question about my codes:

I have code below When it is running on R2021a the output is:

How I convert to numeric values I try to see results as a :

X: -1

Y: -2

Z: 0

Note: R2021b gives numeric result but I use R2021a matlab software.

2. The second question is my codes ends with numeric values of X,Y and Z . I want to see final results as a equation below, How I code this result? Thank you.

syms A B C
syms X Y Z integer
eqn = (B*C^-1)^X * (B)^Y * (A*B^-3)^Z * (B^3*C^-1) == A^0*B^0*C^0
seqn = simplify(lhs(eqn)) == simplify(rhs(eqn))
collect(lhs(seqn),C)
powers = findSymType(ans, 'power')
need_to_solve = arrayfun(@(expression) children(expression,2), powers)
syms X Y Z %remove assumptions
sol = solve(need_to_solve)

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Answer 1

Walter Roberson 2022-1-18

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1630945-symbols-to-numeric-values#answer_876525

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I already showed you

X = double(sol.X)
Y = double(sol.Y)
Z = double(sol.Z)

... about 11 hours ago.

To get that format of display, you can either text() everything into place, or you can use displayFormula https://www.mathworks.com/help/symbolic/displayformula.html -- though that might only work if you are using LiveScript, perhaps.