I would like to get the b value in Matalb.

Question

Redwood 2013-5-16

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Dear Matlab experts,

I would like to get the b value in Matlab, but I got nothing in Matlab. I attached my coding below. Please let me know how to get the b value.

syms b G G1 M1 M2 M3 P1 P2 P3
b  = 0:.0001:10;
Out=solve(' G1 == G*(P1*exp(-b*M1/P1)/( P1*exp(-b*M1/P1)+ P2*exp(-b*M2/P2) + P3*exp(-b*M3/P3)))', b)
G = [7340, 7194];
G1 = [4516.881,  5002.953];
M1 = [5222.328, 6009.419];
M2 = [3264.034, 2632.621];
M3 = [1264.034, 1632.621];
P1 = [3000, 3025];
P2 = [10000, 10051];
P3 = [5000, 5051];
Out=subs(Out)

Thank you very much in advance.

Sincerely,

Redwood

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Answer 1

Walter Roberson 2013-5-16

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在 MATLAB Online 中打开

Use

syms b

instead of assigning a numeric value to b.

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Answer 2

Redwood 2013-5-16

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Dear Walter,

Thank you very much for your help.

I already used syms b.

But I did not get anything in Matlab.

Sincerely yours,

Redwood

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Walter Roberson 2013-5-16

Is there reason to expect that there is an algebraic solution? If not then you are going to have to do the substitution first and then do a numeric solution. You will likely have to do each set of values individually rather than the two sets together.

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