solve returns Empty sym: 0-by-1 answer

2021 11 16
1 个回答
更新时间：2021 11 19
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syms h
Tcz=20
To=533.3
k=155
rho=2680
c=963
a=k/(rho*c)
E2=73.1==To+(Tcz-To)*(1-exp((h*h*a*90)/(k*k))*(1-erf((h/k)*(sqrt(a*90)))))
assume(h>0)
[htc]=solve(E2,h)
the code returns
htc=
Empty sym: 0-by-1

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回答（1 个）

Pavan Guntha
Pavan Guntha 2021-11-19

0 个投票

Hi,
The solve function returns an empty object if there isn't any solution to the equation. For instance if the equation is changed as shown below,
E2 = 730 == To+(Tcz-To)*(1-exp((h*h*a*90)/(k*k))*(1-erf((h/k)*(sqrt(a*90)))))
It returns the following solution:
htc =
-555.33097392244426184617865401959
For more information, you could look at the documentation page of solve.
Hope it helps!

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