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Mathcad: differentiating with indexes

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  1. Oct 1, 2012 #1

    Uku

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    Hello!

    The picture says a thousand words:
    http://www.hot.ee/jaaniussikesed/v6rrand.jpg [Broken]

    In the last member under the square root, there is the error. For some reason I am not able to differentiate with an array index, ts1 is a single column 5 row matrix. How to solve this? The error says "a name is required here".

    Thanks,
    U.
     
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Oct 4, 2012 #2
    Try assigning ts1[i to a variable, t say, and differentiate that instead.

    attachment.php?attachmentid=51500&stc=1&d=1349334622.jpg
     

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    Last edited by a moderator: May 6, 2017
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