Routines

When contributing routines, please follow these guidelines: A routine should be self-contained, and relatively short in length. Exclude the input and output, unless the routine is specifically meant to do that. A routine should be thoroughly tested to make sure it works correctly. Use the Routine Template as the starting point for routine pages. When the routine page is finished, link to it from here.

Conversion

• Number to String (alternative) — Converts a real number to a string.
• Matrix to String — Converts a matrix of encoded letters to a string.
• List to String (alternative) — Converts a list of encoded letters to a string.
• String to List (alternative) — Converts a string to a list of encoded letters.
• Decimal to Fraction (alternative) — Converts a decimal number to a fraction.
• Numerically Index Words — Retrieves a word from an indexed string of words with an index number.

Number

• Number One-Liners — One or two line routines too short for their own page.
• Number Subset — Returns a subset of a number.
• Number or String — Detect Whether Ans is a String or a Number.
• Number or List — Detect Whether Ans is a List or a Number.
• Binary to Decimal — Returns the Base₁₀ form of a Base₂ number.
• Decimal to Binary — Returns the Base₂ form of a Base₁₀ number.

List & Matrix

• List & Matrix One-Liners — One or two line routines too short for their own page.
• Sum of Matrix Elements — Sums the elements of a matrix.
• List Frequency — Finds the frequency of values in a list.
• List Frequency Sorting — Sorts a list based on the frequency of the values
• RLE Compression — Compresses a list of numbers.
• RLE Decompression — Reverses the above routine.
• Binary Data Compression — Bitwise compression of binary data.
• Isolating Element Index Number — Finds the index number of an element number in a list.
• Find Sublist — Finds a sublist within a list, with varying degrees of specificity.

String

• String One-Liners — One or two line routines too short for their own page.
• Reverse a String — Reverses a string.
• Strip a String — Strips a string of its outside spaces.
• Scramble a String — Scrambles a string.
• Change Case of a String — Changes a string to lowercase or uppercase.
• Find and Replace Text in String — Finds and replaces all occurrences of specified text in a string with desired replacement text.

Text

• Highlighting Text — Invert text to white on a black background.
• Wordwrapping Text — Split text between several lines on the graph screen.
• Marquee — Scroll a one-line string, like a marquee.
• Blinking Text — Creates a blinking effect on the home screen.
• Typewriter — Makes text appear letter by letter.
• Text Wrapper — Wraps text on either the graph screen or the home screen.

Graphics

• Shading Circles — Draws a shaded circle.
• Draw Ellipse — Draws an ellipse at the selected coordinates.
• Custom Menu single page — Draws and navigate through a menu and returns the number of option.
• Custom Menu multi page — Draws and navigate through a menu and returns the number of option.
• Custom Graph Screen Menu — Draws and navigate through a menu on the graph screen

Math

• Math One-Liners — One or two line routines too short for their own page.
• Goodness-of-Fit Test — Performs a chi-square goodness-of-fit test.
• Linear Regression Standard Error — Computes the standard error of linear regression coefficients.
• Quadratic Formula — Finds the roots of a quadratic equation.
• Cubic Formula — Finds the roots of a cubic equation.
• Quartic Formula — Finds the roots of a quartic equation.
• Simplify Radicals — Simplifies a square root radical.
• Pythagorean Triples — Displays the Pythagorean theorem triples.
• Number Factorization — Finds the factors of a number.
• Polynomial Division — Divides polynomials of any degree.
• Sierpinski Triangle — Displays the Sierpinski triangle fractal.
• Pascal's Triangle — Gets a row of Pascal's triangle.
• Modular Arithmetic Solver — Solves modular arithmetic problems, also usable for finding a remainder.
• Day of Week (Alternative) — Substitute for the dayOfWk( command for pre-84+ calculators.
• Day, Date & Time — displays Day, Month, Year, Day of week and Time with no user input.
• Easter Calculation — Calculates the Easter Sunday of any given year.
• Synthetic Division — Calculates a0xn + a1xn-1 +a2xn-2 + … + an-1x + an/(x-r) , (where a0 ≠ 0)
• Newtons Method — Calculates the value of the zeroes and intersections of equations.
• Eulers Method — Predicts the future value of a function.
• Mode — Calculates the mode(s) of a list of numbers.
• Extended Euclidean Algorithm — Performs the Extended Euclidean algorithm on two whole numbers.
• Angle of Intersection — Finds the angle of intersection of any two lines.

Keyboard

• Key Code Retriever — Displays the key code for any key that you press.
• Key Code to Letter — Outputs the letter corresponding to the key press.
• Number Pad Reader — Output the number pressed (0-9) or any other key.

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