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.
Get help from a doctor now âº. 1-4 days: Most sources list the time for positive Cocaine in the urine from urine drug screen to be 1 to 4 days, with an average time of 3 days.Confirmatory testing for Cocaine rarely reveals a false positive screening. ...Read more.et help from a doctor now âº. 1-4 days: Most sources list the time for positive Cocaine in the urine from urine drug screen to be 1 to 4 days, with an average time of 3 days.