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Mathematica

Dsolve.. The Function appears with no argument..

Daniel Winge

Posted 12 years ago

DSolve[{k'[ t ] == k^3*t^2, k[1] == 3}, k[ t ], t] and I get the error DSolve::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

POSTED BY: Daniel Winge

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Gianluca Gorni

Gianluca Gorni, University of Udine

Posted 2 years ago

The argument of `Log`, and of all the functions in WL, must be within square braces `[]`, not parentheses `()`.

POSTED BY: Gianluca Gorni

VANI MADHAVI TUKKAPURAM

VANI MADHAVI TUKKAPURAM, Hyderabad

Posted 2 years 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: 17.1.23.nb

(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