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# Dsolve.. The Function appears with no argument..

Posted 11 years ago
 DSolve[{k'[ t ] == k^3*t^2, k == 3}, k[ t ], t]and I get the errorDSolve::dvnoarg: The function k appears with no arguments. >>I've tried clearing and using only one =, but neither seems to work. What's the problem?Edit: there are no spaces in the brackets in the actual code, just put those in because they wouldn't show otherwise.ty
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Posted 11 months ago
 The argument of Log, and of all the functions in WL, must be within square braces [], not parentheses ().
Posted 11 months ago
 (1/T)(-Co + DCsT - Cp D ((Log (1 + R - t1)^2)/(1 + R - T) + t1) - Cd D (-T + (Log (1 + R - t1)^2)/(1 + R - T) + t1) - Ch (-((D t1^2)/2) + D t1 ((Log (1 + R - t1)^2)/(1 + R - T) + t1) + D (1 + R) (-Log (1 + R - T) T + Log (1 + R - t1) t1 + 1/2 (T + 3 t1) + ( Log (1 + R - t1) (1/2 (-1 - R) - T + t1 - 3/2 (R + t1^2)))/( 1 + R - T)))) Differentiate with respect to T Attachments:
Posted 11 years ago
 Ah the k[ t ] ^3 also needed [ t ] .. didn't think so. Problem resolved.Thanks.
Posted 11 years ago
 Somewhere in the input there is a 'k' which should be 'k[ t ]', in other words the function k appears without an argument.