Not enough input arguments

Question

Sumayya 2023-12-12

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2059624-not-enough-input-arguments

回答： Aiswarya 2023-12-18

Hi, i need help. When i try to run this line of code,

function [prob, mean_val, one_std, two_std, area] = calcProbs(pdf, a, b, mu1, sigma1, mu2, sigma2)
% Integrate the probability density function over the interval [a, b] to get the probability
prob = integral(pdf, a, b);

An error shows which says,

>> calcProbs(pdf, a, b, mu1, sigma1, mu2, sigma2)
Error using pdf
Requires at least two input arguments.

Im not sure where im going wrong.

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Sumayya 2023-12-12

That makes sense, if i did have the values, would i put it after or before

function [prob, mean_val, one_std, two_std, area] = calcProbs(pdf, a, b, mu1, sigma1, mu2, sigma2)

Torsten 2023-12-12

在 MATLAB Online 中打开

% Script part
pdf = ...
a = ...
b = ...
mu1 = ...
sigma1 = ...
mu2 = ...
sigma2 = ...
[prob, mean_val, one_std, two_std, area] = calcProbs(pdf, a, b, mu1, sigma1, mu2, sigma2)
% function part
function [prob, mean_val, one_std, two_std, area] = calcProbs(pdf, a, b, mu1, sigma1, mu2, sigma2)
   ...
end

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Answer 1

Aiswarya 2023-12-18

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2059624-not-enough-input-arguments#answer_1373437

Hi Sumayya,

I understand that you want to create a function which calculate probabilities based on a probability density function ("pdf") given as input. The error "Error using pdf. Requires at least two input arguments." is because you haven't defined the variables for your inputs before calling the function. So the term 'pdf' refers to the following inbuilt function in MATLAB : https://www.mathworks.com/help/stats/prob.normaldistribution.pdf.html

This function gets invoked when you use the term 'pdf'. The minimum number of arguments for this function is 2 and hence the error.

This can be solved by initializing the variable 'pdf' properly before calling the function 'calcProbs' or a better alternative would be to rename the variable.

Also, you should define your all input arguments in the workspace before calling your function, in order for your function call to work.