Question

MATLAB 2019

The main function will have exactly one input and exactly one output. Using best practices, check the number of input arguments as well as the type of input.

This function should only accept a vector (row or column). This also means that the value COULD be a scalar value. This function should accept scalars as well. The vector should be numeric, but can be any value: positive or negative, whole number or rational number.

Throw a descriptive error if these conditions are not met.

Question!: How do you create a function and make sure the user inputs the correct type of value into it? In this case, how do you make sure that the function only accepts a vector with numbers in it?

Please provide the specific code in MATLAB 2019.

Answer 1

Matlab code is:

==============================================================================

%% function to check input argument and output argument scalar vector
function [output] = CheckRequirement(input)
%%% nargin checks number of input argument
switch nargin
case 1
fprintf('Number of input argument is 1...\n');
output = "input is correct";
otherwise
fprintf('Number of input argument is not 1\n');
return;
end
%%% nargout checks number of output argument
switch nargout
case 1
fprintf('Number of output argument is 1\n');
output = output+ ";output is correct";
otherwise
fprintf('Number of output argument is not 1\n');
return;
  
end
%%% checking whetger input is scalar or vector
check = isscalar(input);
switch check
case 1
if isnumeric(input)==1%% scalar is numeric or not
fprintf('input is scalar and numeric\n');
else
fprintf('input is scalar and not numeric\n');
end
case 0
if isnumeric(input)==1%% vector is numeric or not
fprintf('input is vector and numeric\n');
else
fprintf('input is vector and not numeric');
end
end

end

============= screenshots of the code and the output===============================

========================== end of the explanation ===================================

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%% function to check input argument and output argument scalar vector function (output] = CheckRequirement (input) %%% nargin checks number of input argument switch nargin case 1 fprintf('Number of input argument is 1...\n'); output = "input is correct"; otherwise fprintf('Number of input argument is not i\n'); return; end %%% nargout checks number of output argument switch nargout case 1 fprintf('Number of output argument is i\n'); output = output+ ";output is correct"; otherwise fprintf('Number of output argument is not 1\n'); return; end %%% checking whetger input is scalar or vector check = isscalar (input); switch check case 1

ULUL 1 fprintf('input is scalar and numeric\n'); else fprintf('input is scalar and not numeric\n'); end case o if isnumeric (input) ==1%% vector is numeric or not fprintf('input is vector and numeric\n'); else fprintf('input is vector and not numeric'); end end end

>> out = CheckRequirement ([6 7 8 9]) Number of input argument is 1.... Number of output argument is 1 input is vector and numeric out = "input is correct;output is correct" >> out = CheckRequirement (4) Number of input argument is 1... Number of output argument is 1 input is scalar and numeric out = "input is correct;output is correct" >> out = CheckRequirement () Number of input argument is not 1 Output argument "output" (and maybe others) not assigned during call to "CheckRequirement".