incremental values 1-100

fr8

if 1 = 1000 and 100 = 4500000

how can i use php to find the increments?

thorpe

Doesn't really make sense. 1 can never be equal to 1000 nor can 100 ever be equal to 4500000.

fr8

let me ask another way. if a = 1000 and z = 4500000, then b= xxxx, c= xxxx, d = ect.
how can i increment 1000 in an exponential function?

thorpe

So basicaly you want a loop that starts at 1000 runs for 100 times and finishes equally 4500000. Ive no idea... but I'll have a play around.

fr8

yes. but it doesnt have to be 4500000. thats just a ballpark figure that i was throwing out.

i thought this was easy until i started testing some for loops. looks like i need to go back and take some more math classes.

thorpe

Hehe... me too. There's a few people here though that are real good with this sort of thing. Be patient.

dream_scape

just some simple math really 😉

function getIncrement($start, $end, $times) {
	$distance = $times - 1;
	$increment = ($end - $start) / $distance;
	return $increment;
}

Here is function to test it:

function testIncrementLoop($start, $times, $increment) {
	for ($i=1; $i<=$times; $i++) {
		echo "$i: $start\n";
		$start += $increment;
	}
}

Here are some tests. (I ran these from the PHP 5 console):

php > echo getIncrement(1000, 4500000, 100);
45444.444444444
php > 
php > testIncrementLoop(1000, 100, getIncrement(1000, 4500000, 100));
1: 1000
2: 46444.444444444
3: 91888.888888889
4: 137333.33333333
5: 182777.77777778
6: 228222.22222222
7: 273666.66666667
8: 319111.11111111
9: 364555.55555556
10: 410000
11: 455444.44444444
12: 500888.88888889
13: 546333.33333333
14: 591777.77777778
15: 637222.22222222
16: 682666.66666667
17: 728111.11111111
18: 773555.55555556
19: 819000
20: 864444.44444444
21: 909888.88888889
22: 955333.33333333
23: 1000777.7777778
24: 1046222.2222222
25: 1091666.6666667
26: 1137111.1111111
27: 1182555.5555556
28: 1228000
29: 1273444.4444444
30: 1318888.8888889
31: 1364333.3333333
32: 1409777.7777778
33: 1455222.2222222
34: 1500666.6666667
35: 1546111.1111111
36: 1591555.5555556
37: 1637000
38: 1682444.4444444
39: 1727888.8888889
40: 1773333.3333333
41: 1818777.7777778
42: 1864222.2222222
43: 1909666.6666667
44: 1955111.1111111
45: 2000555.5555556
46: 2046000
47: 2091444.4444444
48: 2136888.8888889
49: 2182333.3333333
50: 2227777.7777778
51: 2273222.2222222
52: 2318666.6666667
53: 2364111.1111111
54: 2409555.5555556
55: 2455000
56: 2500444.4444444
57: 2545888.8888889
58: 2591333.3333333
59: 2636777.7777778
60: 2682222.2222222
61: 2727666.6666667
62: 2773111.1111111
63: 2818555.5555556
64: 2864000
65: 2909444.4444444
66: 2954888.8888889
67: 3000333.3333333
68: 3045777.7777778
69: 3091222.2222222
70: 3136666.6666667
71: 3182111.1111111
72: 3227555.5555556
73: 3273000
74: 3318444.4444444
75: 3363888.8888889
76: 3409333.3333333
77: 3454777.7777778
78: 3500222.2222222
79: 3545666.6666667
80: 3591111.1111111
81: 3636555.5555556
82: 3682000
83: 3727444.4444444
84: 3772888.8888889
85: 3818333.3333333
86: 3863777.7777778
87: 3909222.2222222
88: 3954666.6666667
89: 4000111.1111111
90: 4045555.5555556
91: 4091000
92: 4136444.4444444
93: 4181888.8888889
94: 4227333.3333333
95: 4272777.7777778
96: 4318222.2222222
97: 4363666.6666667
98: 4409111.1111111
99: 4454555.5555556
100: 4500000
php >

I think this is what you are looking for, right?

fr8

i think thats going to get me where i need to go. thanks.

edit: ill leave the thread open until midnight. If i dont come up with a problem by then ill make the thread resolved.

dream_scape

I also was going to post, but figured you'd be able to get it from here, an example function to get the value of a specific interval, for example say you want the 19th interval and it returns 819000 in this example.

If you need that and have trouble, what I would do make a function definition take 3 params: start, increment, and interval. All you have to basically do is calculate "start + (increment * [interval - 1])".

If you noticed all of my example functions take the same variables quite a bit. So you might also want to make a nice little class that would really clean things up (you'd only have to pass it the params once).