why matlab is not calculating erfc?

3 次查看（过去 30 天）
Atr cheema
Atr cheema 2015-11-29
回答： Star Strider 2015-11-29
I am writing a code requiring matlab to calculate something. Matlab is showing me answer as function of erfc. I can put the answer in a seperate editor file to calculate it. Why MATLAB is not calculating erfc directly itself. My code is
deltaH = 2;
x = 100;
l = 300;
p = 2;
omea= x/l;
deltat = 5;
v = 140;
syms m
u = x/sqrt(v*deltat);
erfun = erfc(u/2*sqrt(p-m));
tek = deltaH*erfun;
summ = symsum(tek,m,1,p)
I am getting answer as 2*erfc((5*7^(1/2))/7) + 2 which can be evaluated but I want MATLAB to give me answer as a number.

请先登录，再回答此问题。

采纳的回答

Star Strider
Star Strider 2015-11-29
I did not run your code, but if you want a numerical answer change the ‘summ’ line to:
summ = vpa(symsum(tek,m,1,p))

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Multirate Signal Processing 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