Forcing matlab to simplify symbolic expression

2020 5 7
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更新时间：2020 5 7
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How do I get matlab to simplify this answer in the script?
c = 3e8;
h = 6.626e-34;
k = 1.38e-23;
syms l T
eqn = exp((h*c)/(l * k * T)) * (((h*c)/(l * k * T)) -5) + 5 == 0;
lmax = solve(eqn, l)
lmax =
2886030032919217/(200358257643048576*T*(lambertw(0, -5*exp(-5)) + 5))
I can take out the symbolic variable "T" within the lmax answer and matlab easily calculates a simple answer. What gives?

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Star Strider
Star Strider 2020-5-7

2 个投票

Use the vpa function:
lmax = vpa(solve(eqn, l))
produces:
lmax =
0.0029011110628620153129357555503486/T
It is not possible to use vpasolve in this expression. The vpa function must be called separately.

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