Round a calculation result.

[wizzuriz]

Hello all.

I have a tricky one.

I want to round my calculation result with 2.5

Example : 139.90 should become 140.00
Example : 136.01 should become 135.00
Example : 137.11 should become 137.50

In other words is hold round to the nearest in the 2.5 range. 2.5 - 5.00 - 7.50 - 10.00 - 12.50 - 15.00 132.50 - 135.00 - 137.50 - 140.00 any idea how to do that.

Best regards
Wizzuriz

PS. if you need to see more please let me know.

[jacek]

You can use round() to round a number.

echo round(139.90); // 140

but to round to the nearest .5 you will need to use some more maths.

echo round(139.9 * 2) / 2;

maybe ?

[wizzuriz]

Hey Jacek.

Thanks for the fast replay, the thing is that I don't just need it to round it I need it to select the correct value.

its the result is 40.39 it should be 40.00 but if its 41.39 it should be 42.50.

<td id="tdgraa"><P>Step 0,2 <?php printf("%5.2f\n",$Display_step2);?></p></td> don´t round any but it will let me display the .00 and if I use <?php echo round($Display_step1 *2) /2;?> it rounds it to 41.50 and its should be 42.50 or 40.00 one or the other.

any idea?

Best regards
wizzuriz.

[jacek]

I don't really get how your rounding works. why should 41.39 wound up to 42.5 and not just 42 ?

[Carbine]

I don't really get how your rounding works. why should 41.39 wound up to 42.5 and not just 42 ?

He wants to round to the nearest multiple of 2.5.

[wizzuriz]

Hello all.

I'm new in programming and I have a problem with rounding some values.

how could this work?

function round($my_number){

I don´t know how to put in xx value so i use * please let me know if there is a other way because the value cloud be 40.59 or 81.31 that i need to round in the same function.

If ($my_number =<*1.25);

     round floor(($my_number)/2.5)*2.5;
}
else if round celi(($my_number =>*1.26)/2.5*2.5; 
     
}

My results will be 40.00 to 200.00
The thing is what ever value I get from my calculation 40.00 , 42.50 , 45.00 , 47.50 or 50.00

My problem is if I use ceil(intval($my_number)/2.5)*2.5; is that if the result is 40.01 it will still round up.

Please let me know if you have a function, and if you cloud please show the echo round_function($my_number); så I know how to echo it on my page.

Thanks all.
Best regards
wizzuriz

[jacek]

I don't really get how your rounding works. why should 41.39 wound up to 42.5 and not just 42 ?

He wants to round to the nearest multiple of 2.5.

Well would

echo round($number * 4, 1) / 4;

do that ?

[wizzuriz]

Thank for the help but it still is not the right value.

I get 48,75 its should be 47,50 or 50.00 not 47,75

round ($number* 4, 1) / 4

That don't work.


best regards
wizzuriz

[jacek]

Maybe replace 4 with 8

this can work, just meed to get the number right.

For some reason I have only looked at this topic at stupid times so can't be bothered to get paper to work it out.

[wizzuriz]

Hi Jacek.

Can you please tell me the idea of the calculation, what is the different from 4,1/4 and 8,1 /8 ? it give the same still 48,75.

If I can understand the idea on how to make it I can calculate it myself.

A other ting is do you think you can help me build a function that can make my calculation more simple?

I think a while function cloud work with this.

My calculation is 90 different values but its a same formula and now i just have 90 lines with the same calculation where I just change the $specific_value for each calculation.

see this is my calculation

[syntax=php]
$result_x1 = $bcl109*pow($bcp_aa15_op1,$op2)*$value*$nk3*$oul87;
[/syntax]

I don't understand the concept on how to create / build a function yet but is reading on that part.

I'm working on something like this.
// this function should get $value from the database and return it as $value then it should take all the other values and return them and each time pass them to the calculation and return them all in a array where I can take them out.

[syntax=php]$result=array();

function calculation_multiple_times(){

$value = SELECT
"`value` FROM `calculations_values`
WHERE `user_name` = '{$user}'

mysql_query=$value;

Return =$value;

while = value = 1 : 0
$result = $bcl109*pow($bcp_aa15_op1,[b]$value[/b])*$uv1*$nk3*$oul87;
}[/syntax]

Now this don't work but I think there would be a way to calculate all values in the same function ??

Please let me know if you know how to build such a function or know where I can get information about it.

Best regards
Wizzuirz.

[jacek]

Can you please tell me the idea of the calculation, what is the different from 4,1/4 and 8,1 /8 ? it give the same still 48,75.

If you use 2 it rounds to the nearest 0.5

Take the example of 10.3

10.3 * 2 = 20.6
round(20.6) = 21
21 / 2 = 10.5

If we use 4 instead of 2

10.3 * 4 = 41.2
round(41.2) = 41
41 / 4 = 10.25

rounding to the nearest 0.25

So you want wounding to the nearest 2.5, so if we use 0.4

41.39 * 0.4 = 16.556
round(16.556) = 17
17 / 0.4 = 42.5

The formula to work out the number you multiply by is

1 / [what you want to round to] = number

In this case

1 / 2.5 = 0.4