differentiating function & getting different answer

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Noah Barrow
Noah Barrow 2019-2-7
评论： Noah Barrow 2019-2-8
hey! I was trying to differentiate this function g(x)=3x-1 and despite the fact that I followed the code provided on the matlab website to a "t", the answer I got within matlab was incorrect. I included a link to the example as well as screenshots of the code they provided and how it appears in my command window.
here's how the code appears on the site:
I typed the same code into my command window but got a different answer...
I'm really confused at this point because now whenever I try to differentiate ANY function I get the same answer!
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回答（2 个）

James Tursa
James Tursa 2019-2-7
编辑：James Tursa 2019-2-7
Perhaps you are shadowing the MATLAB function diff with a function of your own. Make sure diff is pointing to the MATLAB function.
Noah Barrow
Noah Barrow 2019-2-7
can you explain what shadowing is? The code I entered in my command window is directly above-does it appear that my "diff" is pointing to the matlab function?
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Walter Roberson
Walter Roberson 2019-2-8
Execute the command
clearvars
and then run your code again. If the same thing happens, then track down where in your code you assign something to a variable named diff and use a different variable name instead.

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