Solution of dsolve with varible f which is not declared with syms

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Vladan Radulovic
Vladan Radulovic 2012-10-8
编辑： Walter Roberson 2015-7-8
I am trying to get solution of the differential equation of second order with code given bellow:
clc
clear
syms L C R E w t uc
u=dsolve('L*C*D2uc+R*C*Duc+uc-E*cos(w*t)=0','uc(0)=E','Duc(0)=0','t');
MATLAB 7.0 gives me solution in which exists variable "f". As it can be seen, this variable has not been declared. Consequently, If I want to implement subs function, I can not substitute all variables.
What seems to be problem and please, what would be solution?

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回答（1 个）

RahulTandon
RahulTandon 2015-7-7
编辑：Walter Roberson 2015-7-8 
%% Section 1
% IT WORKS, HERE IS THE SOLUTION
clc;
syms L C R E w t uc CLEAR;
u=dsolve('L*C*D2uc+R*C*Duc+uc-E*cos(w*t)==0','uc(0)=E','Duc(0)=0','t');
% THERE IS NO F IN THE SOLUTION
% BUT IT IS A LONG AND COMPLEX ONE

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