Lists

Overview

You can make lists in Desmos using square brackets like this:


You can create lists with evenly spaced elements. [1,...,10] is a list of the integers between 1 and 10. [1,3,...,11] is a list of the odd integers between 1 and 11. Table columns are available as lists in the rest of the system.

You can use lists anywhere in expressions that you would use a number. 

 

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11 Comments

  • 1
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    Abotting213

    What is the maximum length of a list? May I have 16,000 elements in it?

  • 2
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    Kashi Yamagato

    Can I access an item of a specific index? Say I have a list (or a table) and I want the last item in the list. Is there a way to do this?

  • 2
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    Team Desmos

    Kashi - you can find a certain number in a list like x1[3] will give the 3rd number in the x1 list. 

  • 2
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    Aran Glancy

    Can you concatenate lists? For example, if I have a=[1,2,3,4] and b=[5,4,3,2,1] and I want to get c=[1,2,3,4,5,4,3,2,1] can I do something like c=a+b?   

  • 2
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    Team Desmos

    Aran - not currently, but it's on our list!

  • 0
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    MrYurihi redstone

    Can you get multiple entries from an list, like getting entries 2 to 6, but in one thing? If not, how could you get Quartile 1 and Quartile 3 from any given list?

    Edited by MrYurihi redstone
  • 0
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    Kristin

    You can try something like this to reference certain elements in a list: https://www.desmos.com/calculator/zcyahozrpb

    Edited by Kristin
  • 1
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    Bryan Garcia

    I made two original equations to go from binary to decimal and decimal to binary. The binary to decimal uses the lists feature in desmos. I was wondering if there was any way that I could make a number into a list so that I could just type in the number in a function I guess and use that list instead of putting a comma after every single digit in a 20 digits long binary string.

  • 0
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    Serge Ballif

    Bryan Garcia, The trick is to use an intermediary list. I made an example that will convert a decimal whole number to a list of digits. You can modify it as needed. https://www.desmos.com/calculator/7dsepfo2pe

  • 0
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    Serge Ballif

    MrYurihi redstoneYou can use the quantile function in the stats menu. To get Q1 and Q3 of a list A you would use the commands quantile(A,.25) and quantile(A,.75). You can even use the quantile function to sort a list. The worksheet https://www.desmos.com/calculator/rfgwycggun shows an example of a sorted list along with a method to concatenate lists or to get a sublist, 

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    Bombergere23

    Aran Glancy,

    see here for concatenating lists

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