I need help due to unrecognized function or variable ' x ' error, please.

Question

B 2023-11-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2051792-i-need-help-due-to-unrecognized-function-or-variable-x-error-please

评论： Walter Roberson 2023-11-25

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Answer 1

Sulaymon Eshkabilov 2023-11-25

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2051792-i-need-help-due-to-unrecognized-function-or-variable-x-error-please#answer_1359452

在 MATLAB Online 中打开

Here is how to call a function

x = linspace(-10,10);
f=randi(15, size(x));
ANSWER = dd(x,f)
ANSWER = 1×100
1.0e+03 *

    0.0140   -0.0099   -0.0858    0.3436   -0.5003   -0.0743    1.7367   -3.9587    5.6320   -5.9887    5.1183   -3.6821    2.3249   -1.3547    0.7778   -0.4700    0.3062   -0.2078    0.1389   -0.0877    0.0513   -0.0275    0.0135   -0.0061    0.0025   -0.0010    0.0003   -0.0001    0.0000   -0.0000
function a = dd(x, f)
n = length(x);
a =f;
for jj=2:n
for ii=n:-1:jj
a(ii) = (a(ii)-a(ii-1))/(x(ii)-x(ii-jj+1));
end
end
end

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B 2023-11-25

The unrecognized function or variable ' x ' error still persists.

Walter Roberson 2023-11-25

@B

The output shown above, the "ANSWER = " and so on, is output from executing the code here in MATLAB Answers. The code runs successfully, with no error about x

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Answer 2

Sulaymon Eshkabilov 2023-11-25

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2051792-i-need-help-due-to-unrecognized-function-or-variable-x-error-please#answer_1359462

在 MATLAB Online 中打开

Put this code in one M-file or MLX editor window, and hit ctrl+enter

x = linspace(-10,10);
f=randi(15, size(x));
ANSWER = dd(x,f)
function a = dd(x, f)
n = length(x);
a =f;
for jj=2:n
for ii=n:-1:jj
a(ii) = (a(ii)-a(ii-1))/(x(ii)-x(ii-jj+1));
end
end
end