Question

Using Matlab, write a function that takes numeric data as its input argument and prints a message to the Command Window stating if the number is positive, or negative, or 0. This function should transfer an output value to the Workspace ONLY when the input value is negative.

Please include a copiable code and the associated screenshots.

Answer 1

Let us step by step implement funciton following given points in question,

Step 1. Check if numeric data entered: To check for numeric input we can use isnumeric function.

if(isnumeric(input_to_function)) 
    % numeric entered now proceed to next step
else 
    disp('please enter numeric input');
end

Step 2. prints a message to the Command Window stating if the number is positive, or negative, or 0.

function output_value = check_number(x)
    if(isnumeric(x)) 
        % numeric entered now proceed to next step
        if x>0 
            % number greater than 0 display positve
            disp('Positive'); 
        
        elseif x<0 
            % check if number less than 0, that is negative
            % transfer output to workspace
            disp('Negative') 
            
        else
            disp('Zero'); 
        end
        %end of if statement
    
    else 
        % number not numeric
        disp('please enter numeric input');
    end

    
end

Step 3: This function should transfer an output value to the Workspace ONLY when the input value is negative. we simply pass output_value with input_parameter in our case x.

Final Solution:

function output_value = check_number(x)
    if(isnumeric(x)) 
        % numeric entered now proceed to next step
        if x>0 
            % number greater than 0 display positve
            disp('Positive'); 
        
        elseif x<0 
            % check if number less than 0, that is negative
            % transfer output to workspace
            disp('Negative') 
            output_value = x;
        else
            disp('Zero'); 
        end
        %end of if statement
    
    else 
        % number not numeric
        disp('please enter numeric input');
    end
end

Output: