[symbolic] How to get the equation component?

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Sendy Phang
Sendy Phang 2017-11-28
回答： Walter Roberson 2017-11-29
Hi, I using mlx document to do my symbolic calculation. Just wonder how to access equation's component?
That is, sigma_1 in the image attached.
Many thanks
Sendy

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回答（1 个）

Walter Roberson
Walter Roberson 2017-11-29
[s1_c, s1_p] = coeffs(B2ch, sigma_1);
Now s1_c will be a vector of coefficients of sigma_1 in B2, and s1_p will be the corresponding powers of sigma_1. Only the powers that are used will be present. For example for
B21 = r1^3 + (-2*r2*r3 + sigma_1^2*i)*r1 + r2*sigma_1 + 2*r3
[s1_c,s1_p] = coeffs((B21+r3*2)/r1,sigma_1)
s1_c =
[ 20, r2/r1, (r1^3 - 2*r2*r3*r1 + 4*r3)/r1]
s1_p =
[ sigma_1^2, sigma_1, 1]
Notice that the 1 might be there -- that is sigma_1^0, the constant term relative to sigma_1

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