Trying to fit multiple characters into one element?

Trying to have the program output Monte Carlo (MC) mean cost, standard deviation, and CRM. Receiving an error on line 21. I think it's because I'm trying to fit multiple characters into one element. The specific error is:

Unable to perform assignment because the left and right sides have a different number of elements.

Code is shown below. I'm a Matlab newbie, so any help would be greatly appreciated!

Ns = 100;   %Number of samples
Names = {'So','N1','N2','N3','N4','N5','Si'} %Specify Nodes
CTb = [60 30 10 10 50 20 70 10 20 20 10 20 50 30]; %Expected cost per TB
SDupper = CTb + CTb*0.5
SDlower = CTb - CTb*0.5
SDctb = .50;%Subjective SD for cost per TB

COSTrn = nan(1,Ns); %An array to hold random costs
COSTcrm = nan(1,Ns);%An array to hold the CRM
Sample = 1:Ns;
Nb = 10;

COSTrn(1) = (CTb + CTb*SDctb*randn()); % error - multiple characters into one element?
COSTcrm(1) = COSTrn(1);

for i = 2:Ns
    COSTrn(i) = (CTb + CTb*SDctb*randn());
    COSTcrm(i) = ((i-1)*COSTcrm(i-1) + COSTrn(i))/i;
end
COSTmean = mean(COSTrn)  %what is the mean of all
CRM = COSTcrm(Ns)               %what is the final mean
SD = std(COSTrn)
SE = SD/sqrt(Ns)

figure(1)
histogram(COSTrn,Nb)
title('Histogram of Project Durations')
ylabel('Count')
figure(2)
plot(Sample,COSTcrm)
title('CRM')
xlabel('time')
ylabel('Cumulative Percent')
axis([0,Sample(Ns),0,CTb*1.3])

[Walter Roberson]

Ctb is a vector of length 14. You do a computation with the entire vector (mentioned twice) so the right hand side is a vector of length 14. You then try to store that vector into a single element on the left.

If you fully intend to work vector by vector then you have two reasonable choices:

1. Store into a row of a 2d array. This is a good choice if all the rows will be the same size (though using columns is more efficient)

2. Use cell arrays. This is a good choice if the rows will not all be the same size.

[David No]

Many thanks for the quick response! The output row will be the same size, so will try storing in a 2d array. Thank you again, Walter!

[David No]

Is this a good reference to go off of? Apologies if it's incorrect... new to the coding world.

https://www.mathworks.com/matlabcentral/answers/85241-i-want-to-assign-values-from-a-1d-array-to-2d-array-how-should-i-do-it