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See the recommended documentation of this function
predef
variable protection
Syntax
n = predef() oldnew = predef(n) oldnew = predef('all') oldnew = predef('clear') variables_name = predef('names')
Description
Utility function used for defining "oldest" variables as "protected".
Protected variables cannot be killed. They are not saved
by the save
command. The "oldest" are those appearing last in
the who('get')
.
predef()
gets the number of protected variables.
predef('a[ll]')
sets all the variables protected, it also return
the old and new value of protected variables number.
predef('c[lear]')
unprotect all but the last 7 variables, it also return
the old and new value of protected variables number.
predef(n)
sets the max(n,7)
last defined variables as protected, it also return
the old and new value of protected variables number.
predef('names')
returns a vector of strings with the name of protected variables.
predef('clear')
removes the predefined variables from the list.
Remarks
Variable ans
created automatically when expressions are not assigned is never protected by predef('all')
.
A number of protected variables are set in the start-up file SCI/etc/scilab.start
.
User may in particular set its own predefined variables in user's startup files
SCIHOME/.scilab
or SCIHOME/scilab.ini
Note that it is not possible to protect a new defined variable by using predef(1) .
This means that to protect a variable, Scilab needs to protect all the variables that have been defined before it.
This limitation may disappear with Scilab 6, which will not be stack-designed. |
See also
Report an issue | ||
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