Routines

When contributing routines, please follow these guidelines:

1. A routine should be self-contained, and relatively short in length.
2. Exclude the input and output, unless the routine is specifically meant to do that.
3. A routine should be thoroughly tested to make sure it works correctly.
4. Use the Routine Template as the starting point for routine pages.
5. When the routine page is finished, link to it from here.

Conversion Routines

• 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 — Converts a list of encoded letters to a string.
• String to List — Converts a string to a list of encoded letters.
• Decimal to Fraction — Converts a decimal number to a fraction.

Number Routines

• Number Concatenation — Concatenates two whole numbers together.
• Number Subset — Returns a subset of a number.
• Sum of Digits — Returns the sum of digits of a number.

List & Matrix Routines

• Sum of Matrix Elements — Sums the elements of a matrix.
• List Frequency (2) — Finds the frequency of values in a list.
• RLE Compression — Compresses a list of numbers.
• RLE Decompression — Reverses the above routine.

String Routines

• Reverse a String — Reverses a string.
• Pad a String — Pads a string with spaces.
• Strip a String — Strips a string of its outside spaces.
• Repeat a String — Makes a string that is a copy of itself.
• Scramble a String — Scrambles a string.

Text Manipulation

• 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.

Graphics Routines

• Set Up Friendly Graph — Sets a Friendly Graph (small)
• Shading Circles — Draws a shaded circle.
• Draw Ellipse — Draws an ellipse at the selected coordinates.

Math Routines

• 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.
• 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

Miscellaneous Routines

• Deck of Cards — Manipulates a deck of standard playing cards.
• Day of Week — 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.
• 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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