Apple numbers User Manual

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Chapter 12
    Dictionary of Functions 
 
 estimate:  Optional; an initial rough estimate of the interest rate. If omitted, 10% is 
used. Try adjusting the estimate if RATE fails to return a result.
  
REPLACE
The REPLACE function replaces part of a string with characters from a second string. 
The text to be replaced is specified by its length and position in the text.
REPLACE(current-textstartlengthnew-text)
 current-text:  A text expression.
 start:  A number indicating the first character to replace.
 length:  The number of characters to replace.
 new-text:  The replacement text.
Notes
The new text doesn’t need to be the same length as the removed text.
  
REPT
The REPT function repeats text a specified number of times.
REPT(textcopies)
 text:  The text expression to be repeated.
 copies:  The number of times text is repeated.
  
Examples
RATE(10*12,,-5000,20000) returns 1.16% (when using a fixed number format with a precision of 4). The 
return value indicates that a monthly interest rate of 1.16% (or 13.9% annually) is required for $5,000 to 
grow to $20,000 in 10 years. The number of years is multiplied by 12 to find the number of monthly 
payments.
Examples
REPLACE("received applicant’s forms",10, 9,"Frank") returns "received Frank’s forms".
Examples
REPT("*",5) returns "*****".
REPT("ha",3) returns "hahaha".