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.
You will probably either urinate in a cup or have saliva taken out of your mouth. Urine is the most common sample used. A urine test can detect cocaine metabolites for two to three days after cocaine use. In heavy users, the test may be positive for up to two weeks after use.rine is the most common sample used. A urine test can detect cocaine metabolites for two to three days after cocaine use. In heavy users, the test may be positive for up to two weeks after use.