New to programming, writing my first program for my Econ Test

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Summary:

I need help writing this program which uses lots of lists

New to programming, writing my first program for my Econ Test

Kerrick Martin (guest) 20 Jun 2015 08:50

Hi everyone! I'm a 20 year old Business Major and I am taking an Econ test this Tuesday. I am writing a program that will save me a lot of time on the test, as this teacher is notorious for having his tests go to the minute, and students not completing them in time.

Enough with the sympathy. What I am doing is taking the (y,x) values given to us in L1 and L2 respectively (Don't ask me why he gives us y values before x values, I just wrote my program around this so my dyslexia isn't compounded).

Now what we are doing are drawing Production Possibility Curves, calculating the difference between the consecutive (y,x) values (I store those in L3 and L4 respectively), then to calculate the Price Per Unit for both the X and Y supply curve.

This brings in to my program the first two questions I will have. The first one is, is there a way to procedurally create consecutive lists without doing it manually? (My Ti-84 Plus only goes to L6 before you need to enter more).
The second questions is: To calculate the supply curves for X and Y, once I have additional lists to store the values in, I need to take the original (y,x) (L1,L2) Lists, and store then in say, (L7,L8), but with the catch that all the values put in to (L7,L8) be in the same order, but x<0. I need all 0 values to be deleted from their row. Now each one of these data sets has a zero The Y set has one at the bottom, and the X set has one at the top. It would look like this:

5 0
4 1
3 2
2 3
1 4
0 5

Once the negative values are removed, it needs to resemble

5 1
4 2
3 3
2 4
1 5

That ends my first two primary questions. The next question I have is for automatically ordering values so I can graph order of hiring for resources.

I need to be able to take a row, and use the SortA( command and store that in say, L12

Once I have that done, I need to be able to take my values from my lists that have had 0 removed and the SortA( list, and use Linear Regression to make a line of best first best fit, and store that somewhere.

I know this is asking a lot but this is my first time REALLY programming, and I need a bit of help.

Currently my program looks like:

PROGRAM:ECON
:changeList(-L1)->L2
:changeList(L2)->L3
:L3/L4->L5 (OPPORTUNITY COST PER 1 UNIT OF X AS DESCRIBED IN Y's)
:L4/L3->L6 (OPPORTUNITY COST PER 1 UNIT OF Y AS DESCRIBED IN X's)
:L1->L7 (For Manual Removal of Zeroes)
:L2->L8 (For Manual Removal of Zeroes)
:L5->L9 (Setting up for LinReg, Y values for best hiring for production of X)
:L6->L10 (Setting up for LinReg, X values for best hiring for production of Y)

I have hopefully described this as best as I can. Thanks for any help given! I have tried to be as specific as possible.

Re: New to programming, writing my first program for my Econ Test

Silver Phantom 20 Jun 2015 10:40

You can easily create a new lists with what you have already. By storing the list into the variable name list you want to create, the calculator with automatically make a list with the same name.

For removing the zeroes: if the zeroes are just gonna appear like you say, you can use the seq( command to get a sub list.

seq(L1(y),y,1,dim(L1)-1→L7    //for your y list
seq(L2(x),x,2,dim(L2→L8        //for your x list

This will take all elements, 1 to one less than last for y and 2 to last for x, and copy it to L7 and L8 respectively.

This is all I'm able to churn out of my head waking up. I'll have more ready if you still need help.

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The Silver Phantom welcomes you

[e-mail] Martin (guest) 20 Jun 2015 19:27

I need the zeros in the first two lists to get ALL the differences between points, so I can calculate all the slopes. I just want to remove that range of values, in determinant of how many variables I have in a list. If it is this specific value, I just want it deleted, with no other changes to the list. I tried inputting your code as such but I have a feeling y is not the same as the alphabetical y… gonna need to find out how to input variables other than x. Thank you so far though! I'll take all the help I can get.

Re: New to programming, writing my first program for my Econ Test

Kerrick Martin 20 Jun 2015 22:44

OMG IT WORKS THIS IS AMAZING. this is amazingz. It took a while to figure out the proper syntax even though… you… haditcompletelywrittenoutforme…

thank you! My first 2 questions b answered!

Re: New to programming, writing my first program for my Econ Test

Kerrick Martin 20 Jun 2015 23:35

Hmmm… It seems that what's happening is that the SortA( command doesn't like it when i start using my self created lists (L7 and above). Therefore im trying to store all my intermediate data in those, while I do all my sorting and sequencing in the first six lists, and hopefully, after im done, transpose the final numbers to their original lists.

This is exciting this programming thing!

Re: New to programming, writing my first program for my Econ Test

Kerrick Martin 21 Jun 2015 00:35

I finished the program. Thank you very much for your help. Your lines of code needed some alteration but after some head banging I figured it out. I now have a program that interprets the data for an XY table and outputs all the points to be plotted for the PPC, PPU for both X and Y, and order of hiring and firing for both X and Y.

I had to rewrite the code from the beginning to allow for the fact that the seq( and sortA(/sortD( commands don't like being in user created lists (L7 and upward)

Thank you soooo much! You have no idea how bitchin this is.

Re: New to programming, writing my first program for my Econ Test

Silver Phantom 21 Jun 2015 01:24

No problem!

You should be able to use user created lists… Did you use the L found in the list menu?

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The Silver Phantom welcomes you

Re: New to programming, writing my first program for my Econ Test

Kerrick Martin 21 Jun 2015 02:13

Nope! Im stupid like that :D