
Re: how to set initial values to symbolic variable array?
Posted:
Mar 2, 2013 2:34 AM


Perhaps something like this: In[1]:= Clear[a,r] In[2]:= Array[a,4] Out[2]= {a[1],a[2],a[3],a[4]} In[3]:= f=a[1]+a[2]+a[3]+a[4] Out[3]= a[1]+a[2]+a[3]+a[4] In[4]:= r=Table[a[j]>1,{j,1,4}] Out[4]= {a[1]>1,a[2]>1,a[3]>1,a[4]>1} In[5]:= f/.r Out[5]= 4 Tomas
> From: devout1977@gmail.com > Subject: how to set initial values to symbolic variable array? > To: mathgroup@smc.vnet.net > Date: Wed, 27 Feb 2013 23:45:55 0500 > > > Dear All, > > Suppose I defined a symbolic variable array as > > Array[a,4] > > and defined a function as > > f = a[1] + a[2] + a[3] + a[4] > > I need to evaluate the value of f in the following way, > > f/.{a[1]>1,a[2]>1, ...} > > but specify each element of the array one by one is very troublesome, and I > wonder whether there is something like a group definition like > > f/.{a[1:4]>1} > > to define the four variables at the same time with the same value. > > Thanks for your help, > > Sincerely, > John > >

