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Plots Library for TI-Nspire

TNS Plots document

This library document contains a collection of useful programs and functions which may be used to create and support a range of plot options:

  1. Dual Grids

  2. Complex Plots

  3. Matrix Plots

  4. 3D Plots

  5. Conic Plots

  6. Isometric Grid


  • Dual Grids The functions dualgridx(min,xmax,ymin,ymax) and dualgridy(min,xmax,ymin,ymax) may be used to set up a scatter plot which simulates two side-by-side axes. These may then be used to compare graphs of functions, matrices, even complex mappings.

    • Step 1: It is most useful to begin by storing the axes parameters as variables (right-click on each on a graph page and choose Store from the contextual menu).

    • Step 2: Define variables such as dgx:=dualgridx(min,xmax,ymin,ymax) and dgy:=dualgridy(min,xmax,ymin,ymax). This can be done in Calculator or, even more easily, in Lists & Spreadsheet.

    • Step 3: Set up a scatter plot using dgx and dgy, and then choose Attributes. Change Point Size to the smallest option, and change to connected. All done!

    Now that your dual grids are in place, use the following functions to place functions, matrices, complex lists and other objects on either right or left:

    • shiftl and shiftr will take objects like matrices and functions (entered as strings) and plot them to left or right.

    • shiftxl and shiftyl will plot lists to the left, while shiftxr and shiftyr will plot them to the right.

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  • Complex Grids The dualgrid functions are very useful for studying the effects of complex mappings or transformations upon complex lists or polygons. Three options are available here:

    • 2.1 complex_map(clist,z-map) is a program which takes a complex list and a transformation in z and returns the transformed complex list. e.g. complex_map({2+3i, -3+2i, 2-3i},z2-2z).

    • 2.2 complex(clist, z-map) and complexy(clist,z-map) are functions which take a complex list and return the real and imaginary components of the transformed list.

    • 2.3 cplotx(clist) and cploty(clist) are functions which simply take a complex list and return real and imaginary components for plotting.

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  • Matrix Plots Matrices may be plotted using the program matrix_plot(matrix) or the functions mplotx(matrix) and mploy(matrix).

  • matrix_plot(matrix), when run in Calculator, generates two lists,xv and iv, which when used as the basis for a connected scatter plot, plot the polygon represented by the matrix. Subsequent applications of this program will plot further polygons, until the program resetm() is run to clear settings. This way, such studies as the effects of repeated transformations can be observed.

    Thus, the program matrix_plot is cumulative: successive matrices will be plotted on the same axes until the resetm() program is run. This program also plots a closed polygon, while the mplotx and mploty functions simply plot the x- and y-coordinates as lists.

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  • 3D Plots A simulation of a 3D grid is created using the functions grid3dx(min,xmax,xtick,ymin,ymax,ytick) and

  • Set attributes to show points as crosses, and the plot as connected.

    Use with vector3dx(list) and vector3dy(list).

    These create a scatter plot which, when connected, joins x, y and z-coordinates. Overlay these with segments for best effect.


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  • Conic Plots Part of the Polynomial Toolkit, the function conic_plot will take a string and plot the conic in x and y.

  • If the program par("x,y") is run first, then the conic may be entered directly in the Calculator, without the need for quotes. For graphing, though, the string is required.


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  • Isometric Plots Using the program
    or the functions isox(min,xmax,xtick,ymin,ymax,ytick) and
    an isometric grid can be created using scatter plots.


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