Adding a function with a specific value

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Max Olsen
Max Olsen 2021-3-9
评论： Max Olsen 2021-3-10
Hello. I am trying to add a simple value to a function, but it rejects me every time. I think i've tried every noob idea, and was all out of luck. What am i missing?
f=@(x) x^4-7*x^3+9*x^2+7*x-5;
f+10
  2 个评论
the cyclist
the cyclist 2021-3-9
Which of the following is what you want?
  • Define a new function such that f2(x) is always 10 greater than f(x), for all values of x
  • Find the value of f(x) at a particular value of x, and add 10 to that
  • Something else [please describe]
Jan
Jan 2021-3-9
编辑：Jan 2021-3-9
Because the code is not working, we cannot guess, what you want to achieve.
Remember to post a copy of the error message, if you get one.

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回答（1 个）

Jan
Jan 2021-3-9
You define f as a function handle. Then you have to call it with an argument also:
f = @(x) x^4 - 7 * x^3 + 9 * x^2 + 7 * x - 5;
f(5) + 10 % 15
Or do you want to create another function?
g = @(x) f(x) + 10
g(5) % Of course also 15
  1 个评论
Max Olsen
Max Olsen 2021-3-10
I feel like i tried that already without abything happening, but somehow this helped at doing exactly what i wanted (I wanted to use fzero to find the values at where the function was at -10, but that needed a function that had both the old function and the +10)

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