MATLAB homework help request

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Ong
Ong 2012-10-21
I need help with this question!
The lump sum S to be paid when interest on a loan is compounded
annually is given by S = P(1 + i)n where P is the principal invested,
i is the interest rate, and n is the number of years. Write a function
interest.m that will plot the amount S as it increases through the
years from 1 to n. The main function will call a function to prompt
the user for the number of years (and error-check to make sure that the
user enters a positive integer). The function will then call a function
that will plot S for years 1 through n. It will use .05 for the interest
rate and $10,000 for P.

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回答（2 个）

Image Analyst
Image Analyst 2012-10-21
Check out input() or better, inputdlg(). Then check out plot().
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Ong
Ong 2012-10-22
I was thinking of while loop..but again, if I do use that I cant figure out the condition.
Walter Roberson
Walter Roberson 2012-10-22
The discussion of your other question should happen in your other question.

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Matt J
Matt J 2012-10-21
编辑：Matt J 2012-10-21
Should be easy. Use the INPUT command to get the user input. Then
if isnumeric(n) && isreal(n) && n>=0
etc...
end
Then apply the compounding formula. Then the PLOT command.
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Ong
Ong 2012-10-21
Its not working! Do you have the solution to provide me with so that I can check where went wrong?
Matt J
Matt J 2012-10-21
I do not. However, you can step through the code 1 line at a time and examine the results by setting breakpoints

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