Figure 8.9 (page 442):

P(\theta ) versus \theta for n CSTRs in series, \tau =2.

Code for Figure 8.9

Text of the GNU GPL.

main.m

%% Copyright (C) 2001, James B. Rawlings and John G. Ekerdt
%%
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%% modify it under the terms of the GNU General Public License as
%% published by the Free Software Foundation; either version 2, or (at
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%%
%% This program is distributed in the hope that it will be useful, but
%% WITHOUT ANY WARRANTY; without even the implied warranty of
%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
%% General Public License for more details.
%%
%% You should have received a copy of the GNU General Public License
%% along with this program; see the file COPYING.  If not, write to
%% the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
%% MA 02111-1307, USA.

x=linspace(0,5,200)';
tau=2;
ns=[1 2 3 5 10 25 100];
for i = 1:length(ns) 
  n= ns(i);
  P(:,i)=gammainc(n/tau*x,n);
  p(:,i)=n^n/gamma(n)*x.^(n-1)/tau^n.*exp(-n*x/tau);
end
ptable = [x p];
Ptable = [x P];
plot (Ptable(:,1), Ptable(:,2:8));
title ('Figure 8.9')