Converts a string into a matrix of its ASCII values.


y = vals(s)
Parameters:s (string) – string of length \(N\) where \(N > 0\)
Returns:y (Nx1 matrix) – containing the ASCII values of the characters in the string s.


// Initialize 'k' so it will be 0 for the first iteration of
// the 'do while' loop
k = 0;

// Prompt the user for input
print"Continue Program? [Y/N]";

// Continually check for keyboard input and exit the loop on
// keyboard input
do while (k == 0);
   k = key;

// Follow a different code branch depending upon which key
// the user entered
if k == vals("Y") or k == vals("y");
   print "You chose to continue";
   print "Exiting program now";

In this example the key() function is used to read keyboard input. When key() returns a nonzero value, meaning a key has been pressed, the ASCII value it returns is tested to see if it is an uppercase or lowercase ‘Y’. If it is, the program will follow the first branch and print:

You chose to continue

otherwise, it will follow the second branch and print:

Exiting program now


If the string is null, the function will fail and an error message will be given.

See also

Functions chrs(), ftos(), stof()