Please help me run this - I can't figure out this error!

I receive the following error code toward the bottom for xp:

 Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check
for mismatched delimiters.

Here's my code with annotation:

term=20; %terminal time
Cap=10; %cap or max state
xcrit=3 ; %critical value of x [range 1 to 10]
nchoice=2 ; %number of choices (fight or no fight)

%initialize arrays and vectors used in the program
RHS=zeros(Cap,nchoice); %at each time step, expected fitness of each choice for individual of a given state
opt=zeros(Cap,term); %optimal choice at each state at each time
Ft=zeros(Cap,term); %an array with max expected fitness at each state at each time x=1-10 (rows) at each time t=1-20 (columns) at each time step, for each state, this will be the max fitness over the two choices, which calculate below so for now, fill this array with zeros
x=linspace(1,Cap,Cap)'; %column vector of state values

%initialize x' and x" arrays with a row for each state and column for each choice
xp=zeros(Cap,nchoice); %xprime for each state value, each choice
xpp=zeros(Cap,nchoice); %x double prime for each state value, each choice

%Specify patch parameter values
alpha=[0.25 0.25]; %probability of encountering another male
beta=[0.95 0.95]; %probability of surviving to next time-step
Y=[0.5 0.5]; %probablity of fighting
lambda=[0 1]; %rate of decay in RHP
w = [0.5 0]; %probability of winning a fight
c = [1.5 0]; %cost of losing a fight
v = [2 0]; %gain if win a fight

%Specify values of xprime and x double prime. 
for pp=1:nchoice %loop through the patches 1 to npatch
    xp(:,pp)=chopit(x+(w.*v)(pp)-(1-w)*c(pp),xcrit,Cap);
    xpp(:,pp)=chopit(x-lambda(pp),xcrit,Cap);
end





Code for the chop-it function:
function [state2]=chopit(state1,bottom,top)
%CHOPIT truncates state values at a low of xcrit and a high of Cap input is vector of state values, followed by single values for xcrit and cap outputs a vector of truncated state values

state2=(state1<=bottom).*bottom+(state1>bottom).*(state1<=top).*state1+(state1>top).*top
end

Any help would be greatly appreciated!!!

[Stephen23]

Original question from Macie Smith, copied from Google Cache:

"Please help me run this - I can't figure out this error!"

I receive the following error code toward the bottom for xp:

 Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check
for mismatched delimiters.

Here's my code with annotation:

term=20; %terminal time
Cap=10; %cap or max state
xcrit=3 ; %critical value of x [range 1 to 10]
nchoice=2 ; %number of choices (fight or no fight)
%initialize arrays and vectors used in the program
RHS=zeros(Cap,nchoice); %at each time step, expected fitness of each choice for individual of a given state
opt=zeros(Cap,term); %optimal choice at each state at each time
Ft=zeros(Cap,term); %an array with max expected fitness at each state at each time x=1-10 (rows) at each time t=1-20 (columns) at each time step, for each state, this will be the max fitness over the two choices, which calculate below so for now, fill this array with zeros
x=linspace(1,Cap,Cap)'; %column vector of state values
%initialize x' and x" arrays with a row for each state and column for each choice
xp=zeros(Cap,nchoice); %xprime for each state value, each choice
xpp=zeros(Cap,nchoice); %x double prime for each state value, each choice
%Specify patch parameter values
alpha=[0.25 0.25]; %probability of encountering another male
beta=[0.95 0.95]; %probability of surviving to next time-step
Y=[0.5 0.5]; %probablity of fighting
lambda=[0 1]; %rate of decay in RHP
w = [0.5 0]; %probability of winning a fight
c = [1.5 0]; %cost of losing a fight
v = [2 0]; %gain if win a fight
%Specify values of xprime and x double prime. 
for pp=1:nchoice %loop through the patches 1 to npatch
    xp(:,pp)=chopit(x+(w.*v)(pp)-(1-w)*c(pp),xcrit,Cap);
    xpp(:,pp)=chopit(x-lambda(pp),xcrit,Cap);
end
Code for the chop-it function:
function [state2]=chopit(state1,bottom,top)
%CHOPIT truncates state values at a low of xcrit and a high of Cap input is vector of state values, followed by single values for xcrit and cap outputs a vector of truncated state values
state2=(state1<=bottom).*bottom+(state1>bottom).*(state1<=top).*state1+(state1>top).*top
end

Any help would be greatly appreciated!!!

[Rena Berman]

(Answers Dev) Restored edit

Answer 1

[dpb]

xp(:,pp)=chopit(x+(w.*v)(pp)-(1-w)*c(pp),xcrit,Cap);

Missing an operator between (w.*v) and (pp) or what variable pp is supposed to be subscripting. Don't know what is intended, but

(w.*v)(pp)

is illegal syntax.

[Macie Smith]

pp is part of the loop

it worked the way I have it in a previous run with a different number of choices and different parameters...

I did try to add * and .* before (pp) here but still not running

[dpb]

Can't have done...only place () allowed w/o being an explicit subscript of a variable or as an argument to a function would be as subscript to a cell dereference like {...}(pp) and no such thing here.

Explain what it is you think you're writing here--

w = [0.5 0]; 
v = [2 0]; 

so

(w.*v) ==> [1 0]

a vector. But you can't write a subscript to a vector; only to a variable. You must create an intermediate variable here or write

x+(w(pp)*v(pp))

if that's what you're trying to obtain