TIBASIC:Routines
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When contributing routines, please follow these guidelines:

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.
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.
 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.
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.
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 oneline string, like a marquee.
 Blinking_Text  Creates a blinking effect on the home screen.
 Typewriter  Makes text appear letter by letter.
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.
Math
 Math_One_Liners  One or two line routines too short for their own page.
 GoodnessofFit Test  Performs a chisquare goodnessoffit 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.
 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 pre84+ 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 + a1xn1 +a2xn2 + … + an1x + an/(xr) , (where a0 ≠ 0)
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 (09) or any other key.