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Mathematica > Data Manipulation > Files > Mathematica Expressions in Files > PutAppend (>>>) >

BUILT-IN MATHEMATICA SYMBOL

PutAppend

appends expr to a file.

appends a sequence of expressions

to a file.

PutAppend works the same as Put, except that it adds output to the end of the file, rather than replacing the complete contents of the file.

Append expression values at the end of a temporary file:

Create a directory for temporary files and change to that directory:

Put the value of

in a file:

Update

and append the new value to the file:

The file now contains the two values:

Append successive iterates to the file in a loop:

Reset to the original directory: