Random Initialization w/ Total Sum

[yasemin]

Hi,

I have a question regarding a program I'm writing in C. I have a few variables which I would like to assign a random number to. However the sum of all the numbers I assign should equal 1. I have not been able to find a way to do this. Any suggestions would be appreciated!

Thanks in advance.

[finito]

So you are looking for the logic right?

Get the number of variables, Lets call this N

then 1/N = Lets say this is X.

so you want the to loop N-1 times and get the Decimal Random number Where Max is X.

and then you want the Nth to equal 1-(all your variable Except the Nth Value)

Enjoy

[yasemin]

Hey thank you so much. That sounds like it should do the trick!
:)

[Tellalca]

You may try adding up to lets say 100 and then divide all the values by 100 and assign them to the variables. Like;

a=25 b=30 c=40 d=5 adds up to 100.

var1=25/100
var2=30/100
....

If you get stuck post here again.

Kolay gelsin =)

[yasemin]

Tesekkurler :) I will give these replies a try! :) Thanks guys.

[finito]

Tellalca Brilliant man, why reinvent the wheel.

[yasemin]

any tips on using the rand() function with float numbers?:$ Ive tried :

datapoint[j].membership_value=rand()%x;

where x is a float and membership_value is a float however I get the error:

'%': illegal, right operand has type float.

Ive looked through many forms and tried what has been posted but nothing seems to work.

Thanks for the help!

[finito]

yasemin that's what Tellalca is telling you.

Use Rand get an int to max 100 and divide it by 100.

You will get decimals.