About Functions for Reading and Writing Files

Functions > Reading and Writing Files > About Functions for Reading and Writing Files

The following functions are useful for reading various file types into PTC Mathcad arrays. Descriptions are grouped by file type.

Data Files

• READFILE, WRITEFILE—Reads or writes an array of values from/to delimited, fixed width, or Excel data files.

• READTEXT, WRITETEXT—Reads or writes an array of values from/to text files.

• READBIN, WRITEBIN—Reads or writes an array of values from/to binary data files.

• READCSV, WRITECSV—Reads or writes an array of values from/to comma separated variable (CSV) data files.

• READPRN, WRITEPRN, APPENDPRN—Reads, writes or appends an array of values from/to PRN files.

• READEXCEL, WRITEEXCEL—Reads and writes an array of values from/to Microsoft Excel files.

Image Files

• READ_IMAGE—Reads grayscale images.

• READBMP, WRITEBMP—Reads or writes grayscale bitmap images.

• READRGB, WRITERGB—Reads or writes RGB images stored as simple packed matrices.

Image Properties

• READ_RED, READ_GREEN, READ_BLUE—Reads specific color components from image files.

• READ_HLS, WRITE_HLS—Reads or writes an array of values from/to HLS image files.

• READ_HSV, WRITE_HSV—Reads or writes an array of values from/to HSV image files.

• READ_HLS_SAT, READ_HSV_SAT, READ_LIGHT, READ_VALUE, READ_HUE—Reads the saturation, light, value, or hue component from HLS or HSV image files.

Sound Files

• READWAV, WRITEWAV—Reads and writes arrays containing signal amplitudes in WAV files.

• GETWAVINFO—Creates a vector containing information about a WAV file.

Additional Information

• When you define a file name as an argument to one of the file access functions, you must include the file type. For example, a valid filename is “monalisa.bmp”.

• Pathnames are relative to the current working directory. To verify the current working directory, type the command CWD=.

• In all write functions, both rows and cols arguments are indices that start with 1. ORIGIN does not affect the behavior of read functions.