Undeclared Variables
When a variable is deleted while references to it still exist, or is loaded via a parcel but never declared, its name enters the Undeclared name space. Undeclared variables can cause certain program errors.
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“Science is feasible when the variables are few and can be enumerated; when their combinations are distinct and clear. We are tending toward the condition of science and aspiring to do it. The artist works out his own formulas; the interest of science lies in the art of making science.”
—Paul Valéry (1871–1945)
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