Your call to plot would just use the last value of n from the for loop as the x variable. Instead use something like
period = 2:31;
plot(period,balanceV,'r')
It looks like you also have another problem with your if statement
if balanceV < 10000
this will have the same value for every loop iteration.
I think you probably want to have
if balanceV(n) < 10000
It would be clearer if you initialized the first element of balance using
balanceV(1) = 2000;
so you could see that balanceV was going to be a vector of values.
Even better practice, for memory management and to be sure that you are not using any old values if you rerun the script without always clearing the memory would be to preallocate the array
% preallocate array of zeros to hold the running balance
balanceV = zeros(32,1)
% initialize running balance
balanceV(1) = 2000;
If you paste more code into future questions you can use the code button on the Answers toolbar to insert code and have it be nicely formatted.
