Set the write protection field for a QMatrix object.
QMatrix object do not have a write protection flag of their own, but they use the one from the associated Process object. Write protected objects cannot be modified through get/set methods and virtual fields.
# S3 method for QMatrix
setWriteProtected(this, value, ...)
A QMatrix object.
A logical vector of size one.
Not used.
TRUE or FALSE
setWriteProtected.Process