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derivate problem composite function
 Rank: Newbie
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Joined: 03/06/2015(UTC)
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Hi to all, I create a composed function, but I don't understand what is wrong. Please help dav47 attached the following image(s):
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Rank: Newbie
Groups: Registered
Joined: 03/06/2015(UTC)
Posts: 5
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I attach the file to clarify the problem
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 Rank: Advanced Member Groups: Registered
Joined: 03/02/2014(UTC) Posts: 67  Was thanked: 13 time(s) in 11 post(s)
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When defining a1, b1, c1.. etc, you define them as rows of a matrix (notice how they are still in parenthesis), and they remain a single entry matrix. This causes an error later on since you can't take a derivative of a matrix. Instead of extracting the row, extract the element by using the "el" function, or write the matrix name followed by "[" and the row number. eg. a.1 : M[1 Edited by user 03 June 2015 20:55:03(UTC)
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 1 user thanked Ernesto for this useful post.
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Rank: Advanced Member Groups: Registered
Joined: 15/04/2012(UTC) Posts: 1,990  Was thanked: 1128 time(s) in 724 post(s)
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The cases() function helps a lot in writing piecewise continuous functions in a readable way. File Attachment(s): mkraska attached the following image(s): |
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1 user thanked mkraska for this useful post.
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Rank: Newbie
Groups: Registered
Joined: 03/06/2015(UTC)
Posts: 5
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Hi, Ernesto and Martin.
Thank you for your help.
I'm new to the use of smath studio. I understand my mistake....It's a mathematical error!
Now I have istalled the Function extension.
Bye
Davide
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