Array Element Problems.

[mhaider2]

Hi...

I have question on how to put value or element in array that its value is increment of previous element. I have created 50 array and need to fill it with this example of data:

1,5,9,13,17,21 and so on..(increment of 4)

public static void main(String args[]){

int x[] = new int[50];


for(int i=0; i<=49; i++)
System.out.println("x["+i+"] = "+x[i]);

for(int i=0; i<=49;i++)
x[i] = i; 


for(int i=0; i<=49; i++)
System.out.println("x["+i+"] = "+x[i]);


}

[JosAH]

Draw two axes, an X axis that represents the index value (i.e. 0,1,2,3 etc) and a Y axis that representsa the corresponding values (i.e. 1,5,9,13 etc.) That makes a straight line f(x) == 1+4*x. The x value is the index and the f(x) value is the value of the array element; subtituting i for x makes:

for (int i= 0; i < 50; i++)
   x[i]=1+4*i;

This is geometric interpretation; you can also solve it algebraically: every element of the array is four more than the elements to its left. The first element equals one; so:

x[0]= 1;
for (int i= 1; i < 50; i++)
   x[i]= x[i-1]+4;

kind regards,

Jos

[mhaider2]

thank you very much..before this i try something like this x[i] = i =+4 but apparently does not work out..your method however works and thank you again for your guidance..