solve returns Empty sym: 0-by-1 answer

38 次查看（过去 30 天）
José Miguel Rivera Navarrete
回答： Pavan Guntha 2021-11-19
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

请先登录，再回答此问题。

回答（1 个）

Pavan Guntha
Pavan Guntha 2021-11-19
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!

类别

在 Help Center 和 File Exchange 中查找有关 Number Theory 的更多信息

标签

产品


版本

R2019b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by