exponent with variables

[Bamarama]

I know the basic exponent formula using javascript:
(Math.pow(x,y)}

What I do not know, nor can I find is how to have x and y be variables.

x needs to be the variable of qty.value the formula I am using is

3000 * resfactor * 1.4(qty.value-1) the x-1 is the exponent.

so resfactor is a set variable of 40. so I could write this 120000(1.4 to the qty.value-1 power)

I hope I am making sense with this.

any help would be appreciated

 

[Bamarama]

I have tried this

value = (120000(Math.pow((1.4,(qty.value-1)))))

but It doesn't return anything. By anything I mean it returns blank field. I know the qty.value returns the value from the form, so that part is working.

anything look wrong here?

 

[Bamarama]

Ok, i think I answered my own question with this.

I used value = Math.floor(120000 * Math.pow(1.4,qty.value - 1));
and it appears to be working just fine.

 

[Bamarama]

while I am happy to have figured this out myself, I need help on one more thing. I need the number rounded down to the 10's only rounded down.

for example, if this forumla yields 1234566 i want it to display 1234560 how would I accomplish this?

 

[feherke]

Hi

Math[teal].[/teal][COLOR=darkgoldenrod]floor[/color][teal]([/teal][purple]1234566[/purple] [teal]/[/teal] [purple]10[/purple][teal])[/teal] [teal]*[/teal] [purple]10[/purple]

Feherke.

http://free.rootshell.be/~feherke/

 

[Bamarama]

thanks for the reply

this helped me so I do appreciate it