Re: Differential Equation

*To*: mathgroup at smc.vnet.net*Subject*: [mg132663] Re: Differential Equation*From*: David Reiss <dbreiss at gmail.com>*Date*: Wed, 30 Apr 2014 01:41:35 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-outx@smc.vnet.net*Delivered-to*: mathgroup-newsendx@smc.vnet.net*References*: <ljndih$au0$1@smc.vnet.net>

Check the syntax for the proper use of DSolve. You are looking for DSolve[{Y'[x] == A*f[x] - B*Y[x], Y[C] == 0}, Y, x] Also note that C is a reserved symbol in Mathematica. Generally you should avoide using capital letters for your parameters and functions On Tuesday, April 29, 2014 1:33:05 AM UTC-4, Zohreh wrote: > Dear Friends, > > > > I am going to solve the following differential equation: > > dY(x)/dx=A*f(x)-B*Y(x) > > > > In which A and B are some parameters, f(x) is a function of x, and Y(C)=0 (C is a parameter). > > > > I tried to solve it in Mathematica by > > DSolve[Y'[x] == A*f[x] - B*Y[x], Y[C] == 0, x] > > > > But I get the following error > > DSolve::dsfun: "Y[C]==0 cannot be used as a function > > > > I would highly appreciate it if somebody can help me. > > > > Best reards. C