problem in this integration

2 次查看（过去 30 天）
Nasir Qazi
Nasir Qazi 2012-5-6
% Unable to integrate this , Please help
syms T T0
b = 0.141;cp0 = 38.12;h0 = 1684;R= 8.314;Act_W = 0.98;D_Vm = 3.0;DCP_0 = 1263; DH_0 = 1389;
cp = cp0 + b(T-T0);
h = h0 + int((cp,T,T0,T));
DCP_0/R*T + int((h/R*T^2),T,T0,T) + int((D_Vm/R*T),P,0,P) - log(Act_w)
  1 个评论
Walter Roberson
Walter Roberson 2012-5-6
What problem are you observing? Are you getting an error message? Which of the three integrals are you having difficulty with?
Did you happen to notice that for int((D_Vm/R*T),P,0,P) you are integrating with respect to a variable that does not appear in the expression being integrated?

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Alexander
Alexander 2012-5-7
Not sure what you want to do. Could it be, that you meant this:
syms T T0 P
b = 0.141;cp0 = 38.12;h0 = 1684;R= 8.314;Act_W = 0.98;D_Vm = 3.0;DCP_0 = 1263; DH_0 = 1389;
cp = cp0 + b*(T-T0);
h = h0 + int(cp,T,T0,T);
DCP_0/R*T + int((h/R*T^2),T,T0,T) + int((D_Vm/R*T),P,0,P) - log(Act_W)
I did these changes to your code:
  • syms T T0 P instead of syms T T0
  • b*(T-T0) insteat of b(T-T0)
  • int(cp,T,T0,T) instead of int((cp,T,T0,T))
  • log(Act_W) instead of log(Act_w)

类别

在 Help Center 和 File Exchange 中查找有关 Conversion Between Symbolic and Numeric 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by