MathWorks Support Team (view profile) MATLAB does not recognize the specified string as the name of a function on the MATLAB path or a variable visible to that function. - a typographical error when typing a command or variable name (such as typing a 1 [one] when you intended to type an l [low-case L]).
Blood tests can detect cocaine itself for about 12 hours after use. Urine tests check for metabolic byproducts of cocaine, and in infrequent users a urine test is positive for up to two to three days after cocaine use.
Hair Test for Cocaine. Cocaine may appear in the hair as soon as 8 hours or sometimes only 7-10 days after a single use and can stay there for months â until the hair is cut. The amount of cocaine and time when it was used cannot be reliably determined by a hair test (4).Hair can be contaminated with cocaine from the outside.rine Test for Cocaine. Cocaine can be detected in the urine for 4-8 hours after a single snorted (nasal) dose, and up to 24 hours after a single ingested (oral) dose (1).