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.TH predef 1 "April 1993" "Scilab Group" "Scilab Function"
.so ../sci.an
.SH NAME
predef - variable protection
.SH CALLING SEQUENCE
.nf
n=predef()
oldnew=predef(n)
oldnew=predef('all')
oldnew=predef('clear')
.fi
.SH DESCRIPTION
Utility function used for defining "oldest" variables as "protected".
Protected variables cannot be killed. They are not saved
by the \fV'save'\fR command. The "oldest" are those appearing last in
the\ fVwho('get')\fR.
.LP
\fVpredef()\fR gets the number of protected variables
.LP
\fVpredef('a[ll]')\fR sets all the variables protected, it also return
the old and new value of protected variables number.
.LP
\fVpredef('c[lear]')\fR unprotect all but the last 7 variables, it also return
the old and new value of protected variables number.
.LP
\fVpredef(n)\fR sets the \fVmax(n,7)\fR last defined variables as protected, it also return
the old and new value of protected variables number.
.LP
.SH REMARK
A number of protected variables are set in the start-up file \fVscilab.star\fR.
User may in particular set its own predefined variables in user's startup file
\fVhome/.scilab\fR
.SH SEE ALSO
clear, save
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