Math Is Fun Forum

Hi all,

John, Mathisfun and Bobbym after trying Johns method and it worked. But a little jumpy when it was scanning. So I went back to some old notes. It took a lot of searching about 2 hours going threw old notes and formulas to find it.
I thought they were lost in a move But my wife remembered seeing them in storage.
But I do not wish I had tried to find them before because it caused me to discover this site. I have learned more in the few days that I have been on this site than in several months in school.

So the following is the notes and formula that will take an input and transform it to a value between a min and max.

Equations used in calculating a linear relationship:

Scaled value = (input value x rate) + offset

Rate = (scaled max. - scaled min.) / (input max. - input min.)

Offset = scaled minimum - (input minimum x rate)

Translation to needed to formula for use in program
Original             new            description

Scaled value =  r         = (rate of deduction)
scaled max.  =  rmax   = (r maximum scale)
scaled min.   =  rmin   = (r minimum scale)
Input Max     =  Imax   = ( Maximum value of al)
Input Min     =  Imin    = ( minimum value of al)
Rate           =  Rate1   = (calculated Value)
offset          =  offset  = (calculated value)

r = ( al * rate1 ) + offset
rate1 = ( rmax - rmin ) / ( Imax - Imin )
offset = rmin - ( Imin * rate1 )

This is the program line used in the computer

r = (al * (rmax - rmin) / (Imax - Imin)) + (rmin - (Imin * ((rmax - rmin) / (Imax - Imin))))

Thanks for your help
I know I'll be on this site a lot
For now I have to get back to my program
But I'm Like a bad apple I'll keep showing up

Curtis

Thanks John
I think this will work I only have to have 100 points of the plot to compare the al value to and the 2nd element of the array would be the answer or rate.

Thanks very much I was stuck and now I see light.

Curtis

It does not actually go to zero it is restricted in the program to actually 100 to 1000. The al level is 0 to 1000 but where the calculation is made the level has to be above 100 and using one or two if statements will not hurt its if I have to use 10 or 12 if statements then it might become a real issue. I have already prevented certain program code for being run on every scan due to timeing problems.

I have plotted the parameters on a graph and would insert them but I am not sure how. I know that at the of post reply is the browse and I can find the imgage file then when I press img to insert it comes up with {img}/{img} am I supposed to type the location of the image into the brackets or what?

John.
  Yes it would in a standard calculation and that is one of the reasons I cannot get any of the formulas that I have used in PLC programming to work. In plc programming there is a calculation that is used to scale an input siginal 0 to 20 mv  to an output of 0 to 60 Hz. This uses a 16 bit register which has a maximum of  value of 32768. The 0 to 20 mv is converted to 0 to 32768 then a input minimum value(Imin) and input maximum(Imax) value is used to say that the 0 to 32768  =  Imin to Imax. In this way you can set the Imin to any value less than Imax and Imax can be set to any value greater than Imin and the result of the actual input value will fall between the two.  The output calculation takes this result and uses it with the Omax, Omin to calculate a value that falls between Omin and Omax. The output is then coverted to depending on Omin and Omax to Hz. Example 10 mv input siginal is coverted to 16384. This then is coverted if our Imin is 1000 and Imax is 10000 the the result would be 4500. if the 10 mv changed to say 5 mv with the same parameters then input would be 8192 and the result would be 2250.

I need this so that the value being deducted from energy is lower when the value of alcohol is higher. Alcohol is energy and alcohol is being deduct at 2x the rate of energy at this moment. But Alcohol at this moment does not affect the game except for the speed the man walks. So they have no reason to purchase alcohol but if they Know that it slows the energy rate down then they will be more apt to use alcohol. This will increase the fun by being arrested for public drunk and make gameplay adjustable as to hardness.

But either the formula I remember is incorrect or the requirements are very different. It is most likely my memory.

curtis

John,
  Your suggestion is a good one and that is the way I have it written now. 
 
  Maybe a breif discription of the program will help. The program is cartoon like with a man walking around a city picking up items that he can sell and money thats been dropped. He has to buy food and/or drink to stay alive. Once he has made enough money then he can get cleaned up and work to earn more money. He can purchase things like a home, cars and jewlery. All of these items he can use in some way. There is a bank where he can make investments, and deposits to different accounts. Also if certain accounts get overdrawn for a certain lenght of time this causes the game to end. There are Robbers, Police, and other people walking around. The robbers steal you money and Police arrest you for vagrancy or public drunk. You can take bus rides, a limo, a sports car ect. to your home. But you have to pay for all of this such as when you own a home you have to pay morgage or lease, lights, water, gas,and upkeep.

  Those are just a few thing that is in the program. There are quit few others and some that I have not added yet such as a cosino with a one armed bandit (that I have already written and it was a math nightmare). The slot machine is a good program by itself. I wrote it seperate because the size of the project was slowing my programming software down.

  The energy and alcohol level is the stall point. I cannot see a way of tiying them together other than using a calculation that as alcohol is increased the energy level rate of decrease is decreased. Their are multibale reasons for not using if statements to reduce the rate at certain points you. One thing is if your were watching the alcohol and energy when the change was made it would be very visable. Another is the time used by each if statement. I have only a certain amount of time available because of the graphics. The more if statements I used the worse the graphics flow. This program logic is very large.
 
Thanks John

Thank you Mathisfun and bobbym for the welcome,

I am going to enjoy this forum. The warm welcome came as an unexpected,  but pleasant surprise.

Raider