i dont know how i can take out the max and min value from the vector

Write a MATLAB script that calculates the average of the values in an input vector. However, your script should exclude the maximum and minimum values from calculations. Assume that the values in the vector are unique.

[Steven Lord]

This sounds like a homework assignment. If it is, show us the code you've written to try to solve the problem and ask a specific question about where you're having difficulty and we may be able to provide some guidance.

If you aren't sure where to start because you're not familiar with how to write MATLAB code, I suggest you start with the MATLAB Onramp tutorial (https://www.mathworks.com/support/learn-with-matlab-tutorials.html) to quickly learn the essentials of MATLAB.

If you aren't sure where to start because you're not familiar with the mathematics you'll need to solve the problem, I recommend asking your professor and/or teaching assistant for help.

[Asli]

actually I'm trying to practice for the exam. I don't have a good grasp of matlab, but I want to show the code I wrote, if you can explain it, I would be very happy.

V=[0 1 20 35 56]
avgfunc(V);
function avgfunc(input)
Mean=mean(V);
avgfung(V)=Mean;
disp(Mean)
end

[Voss]

I can explain this piece of code.

% make a variable called V which is a row vector of doubles, with value [0 1 20 35 56],
% and print the variable to the command line
V=[0 1 20 35 56]

% call the function avgfunc with input V
avgfunc(V);

% define the function avgfunc with one input argument called 'input' and no output arguments
function avgfunc(input)

% calculate the mean of V, and store the mean of V as the variable Mean.
% - if avgfunc is nested in a function where V is defined, this is ok.
% - if not, which it appears here not to be a nested function, this line will
% generate an error because V is not defined in the function avgfunc's
% workspace.
Mean=mean(V);

% create a variable called avgfung, and set the elements of avgfung with
% indexes given by the elements of V equal to the value of Mean, filling in
% unspecified elements of avgfung with zeros.
% this line will generate an error with the given V because V contains a 0-
% element and 0 is not a valid index.
avgfung(V)=Mean;

% print the value of Mean to the command line
disp(Mean)

% close the defintion of the function avgfunc
end

[Asli]

thanks

[Stephen23]

https://web.archive.org/web/20211222063126/https://www.mathworks.com/matlabcentral/answers/1615725-i-dont-know-how-i-can-take-out-the-max-and-min-value-from-the-vector

Answer 1

[Walter Roberson]

V=[0 1 20 35 56]

Okay, V will be created in the "base workspace" and assigned that list of values.

avgfunc(V);

And there it will be passed to avgfunc(). If avgfunc() returns any values then display of the values will be supressed because of the semi-colon at the end of the call

function avgfunc(input)

Okay, inside avgfunc(), whatever value has been passed into the function will be known by the nickname input

Mean=mean(V);

That is going to start a search looking for a definition for V . V has not been assigned to yet in the current function, so it is not a local variable. V is not the local name of any parameter to the function -- the one parameter passed in is known as input here. The function is not a "nested function" so V cannot be the name of a "shared variable".

So MATLAB is going to proceed to search for the name V as the name of a function, with there being a well-defined list of places it looks, each with its own priority. But V does not happen to be the name of any function on the seach path, so V will be considered undefined here.

Inside a function if you use the name of a variable that is defined in the "base workspace" or in the calling function, MATLAB will not search the base workspace or the calling function to find a matching variable.

If you wanted the value of the parameter that was passed in, you should have used input in the call instead of V

Beyond that: you are taking the mean of the entire vector. But the problem requires that you remove the minimum and maximum from the vector and take the mean of what remains.

avgfung(V)=Mean;

That would attempt to create a local variable named avgfung indexed by the values stored in V and assign those locations the values stored in Mean . If you were to use input instead of V to get around the problems explained a moment ago, you would encounter the problem that the input contains the value 0, but 0 is not a valid subscript in MATLAB.

I notice that your variable name avgfung is very similar to the name of the function avgfunc . If you were intending to assign to the same name as the function, then please note that in MATLAB, assigning to the name of the function is not the way to return values from the function. If you want to return values from the function, you need to list variable names on the left side of an "=" in the function line, such as

    function Mean = avgfunc(input);

[Asli]

but still i couldnt solve the problem exactly i couldnt remove max and min values from the vector..should i use 'break' to solve rest

[Walter Roberson]

Hint: if you were to sort the vector, then the values to discard would be the first and the last elements of the sorted values.

[Asli]

Thank you very much, I wrote everything from scratch.