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More help with probability...

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Nadia
Nadia on 24 Apr 2013
Hey, so I fixed the first part of this code, but now the for loop where I use "strcmpi" is not working properly. It's only accounting for "peach' and my peach_count returns 100000 and the other fruits are 0. It's really weird because my function works fine.
function x = produce
A = 1e5;
B = rand;
C = ceil(A*B);
if (C>=1 && C<= 20000);
C = 'peach';
elseif (C>= 20001 && C<= 55000);
C = 'panana';
elseif (C >= 55001);
C = 'papaya';
end
x = C
clc; clear all;
peach_count = 0; panana_count = 0; papaya_count = 0;
N = 1e6;
for k = 1:N
fruit = produce;
if strcmpi(fruit,'peach')
peach_count = peach_count + 1;
elseif strcmpi(fruit, 'panana')
panana_count = panana_count + 1;
elseif strcmpi(fruit, 'papaya')
papaya_count = papaya_count + 1;
end
end
What am I doing wrong??

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Nadia
Nadia on 24 Apr 2013
This is so strange. Which produce gives me my user name for the computer. Whos produce gave me nothing. I just decided to start over and copy this code back into matlab and now it says the my 'fruit = produce' line is invalid...I don't what I'm doing wrong. I'll try to play with it a bit more.
Matt Kindig
Matt Kindig on 24 Apr 2013
To explain a little bit about why I was having you do those commands:
  • 'which produce' indicates the path to the produce.m file. I was specifically curious whether you had multiple 'produce.m' files on your path, which your results indicate you do not.
  • 'whos produce' indicates information about any variables 'produce' in your workspace. I had thought that perhaps you had a variable called 'produce' as well, which was overriding the function call. However, the fact that the whos command returned nothing indicates this is not the case.
I must admit that I'm stumped. Are you putting the function into a separate file as the script? In other words, you should have two different m-files:
=== produce.m
function C = produce
A = 1e5;
B = rand;
C = ceil(A*B);
if (C>=1 && C<= 20000);
C = 'peach';
elseif (C>= 20001 && C<= 55000);
C = 'panana';
elseif (C >= 55001);
C = 'papaya';
end
=== main.m (or some other name)
clc; clear;
peach_count = 0; panana_count = 0; papaya_count = 0;
N = 1e6;
for k = 1:N
fruit = produce;
if strcmpi(fruit,'peach')
peach_count = peach_count + 1;
elseif strcmpi(fruit, 'panana')
panana_count = panana_count + 1;
elseif strcmpi(fruit, 'papaya')
papaya_count = papaya_count + 1;
end
end
Nadia
Nadia on 25 Apr 2013
@Matt Kindig thanks so much!! I hadn't put them in separate m-files. Such a silly mistake, but thanks again!

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Accepted Answer

Ahmed A. Selman
Ahmed A. Selman on 24 Apr 2013
Just pay attention to how you use function call inside a program. Either you have two files as stated above, or use one main (calling function) which contains another (inner) function as:
% This is the main (calling) function
function output=firstFunction
peach_count = 0; panana_count = 0; papaya_count = 0;
N = 1e6;
for k = 1:N
fruit = produce;
if strcmpi(fruit,'peach')
peach_count = peach_count + 1;
elseif strcmpi(fruit, 'panana')
panana_count = panana_count + 1;
elseif strcmpi(fruit, 'papaya')
papaya_count = papaya_count + 1;
end
end
output=[peach_count;panana_count;papaya_count];
% Here is the inner function
function x = produce
A = 1e5;
B = rand;
C = ceil(A*B);
if (C>=1 && C<= 20000);
C = 'peach';
elseif (C>= 20001 && C<= 55000);
C = 'panana';
elseif (C >= 55001);
C = 'papaya';
end
x = C;
So, when you run:
OutPut=firstFunction
OutPut=
200191
349241
450568
Note: The output varies since it's based on a random creation.
Regards

  1 Comment

Nadia
Nadia on 25 Apr 2013
Thanks so much!!!

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