EQUATION

[Nullllll]

Hi all ,

I have stepper motor program need ur help in one part of a small equation , ...

I have the equation : please look to the photo>>

I am using for loop for (i=0 ; i<N;i++)

x/N* i-10 =+10 Max

x/N*i_10=_10 Min

so if the result of the equation greater than 10 or not in range og -10 and 10 , it immedailty generate a value for x and N so it can satisfy the equation !!!! I mean if the user enter X it can calcualte Y in the range to get the correct equation , and notice (i) is the iteration of the for loop and N is the condition of for loop.

I mean the result of equation can be between +10 and _10 , I have used in LABVIEW in range in corece but it doesnot correct value of X and N if they are false ??

any help please so if the value not in range -10 to 10 it can correct it!!

Thnks

[Eugen Graf]

I think you have to use the feedback node or shift register to solve your problem. If the input depends from output you can't solve it without feedback.

Eugen

[Jeff Plotzke]

QUOTE(Nullllll @ Mar 14 2007, 06:49 PM)

I am using for loop for (i=0 ; i<N;i++)

x/N* i-10 =+10 Max

x/N*i_10=_10 Min

so if the result of the equation greater than 10 or not in range og -10 and 10 , it immedailty generate a value for x and N so it can satisfy the equation !!!! I mean if the user enter X it can calcualte Y in the range to get the correct equation , and notice (i) is the iteration of the for loop and N is the condition of for loop.

I mean the result of equation can be between +10 and _10 , I have used in LABVIEW in range in corece but it doesnot correct value of X and N if they are false ??

any help please so if the value not in range -10 to 10 it can correct it!!

I don't exactly understand what you're asking. It sounds like you have the equation:

(x/N) * (i-10) = y; where y has to be between -10 and +10

If y is outside the [-10, 10] range, you'd like to have LV find a value for x and N to make y in range. (ie, if y = -15, find values of x and N to make y = -10)

If this is correct, it's just algebra to determine your new value -- However, notice that you can't find values for both x and N -- This is a linear system and x and N have an infinite set of numbers that satisfy a given equation. Therefore, you'll have to hold either x or N constant.

So, for example, if you want to hold N constant, you can find x for the case y = -10 using:

x = (10*N)/(i-10)

So, have LabVIEW determine if your y is within range. If it's not, use another equation to determine a value of x (or N) which will satisify your equation.

Let me know if this isn't what you wanted.

[Eugen Graf]

QUOTE(Jeff Plotzke @ Mar 15 2007, 05:45 AM)

I don't exactly understand what you're asking.

I too. :thumbup: