How to solve error 'Error: File: function9.m Line: 10 Column: 5 Function definition is misplaced or improperly nested.'

function function9

clc
clear all 
close all
Problem_number=input('please enter question number')
if Problem_number==1
    kmh=input('input kilometers');
    ftps=problem_1(kmh);
    function ftps=problem_1(kmh)
    %function problem_1 converts kilometers per hour to meters per second
    ftps=kmh*3281/3600
    end 
elseif Problem_number==2
    days=input('enter the number of days');
    hours=input('enter the number of hours');
    minutes=input('enter the number of minutes');
    minout=problem_2(days,hours,minutes);
    function minout=problem_2(days,hours,minutes)
    minout=minutes+(hours*60)+(days*1440)
    end 
elseif Problem_number==3
   x=input('enter a value for x');
   y=input('enter a value for y');
   [theta,radius]=problem_3(x,y);
   function [theta,radius]=problem_3(x,y)
   theta=atan2(y,x)
   radius=sqrt(x^2+y^2)
   end
elseif Problem_number==4
    X=[-3 3];
    Y=problem_4(X);
    function Y=problem_4(X)
    Y=0.9*X.^4-12*X.^2-5*X 
    end 
    X2=linspace(-4,4,9);
    Y2=problem_4(X2);
    plot(X2,Y2)
    xlabel('x from -4 to 4')
    ylabel('problem_4(x)')
    title('Problem 4 Graph')
end 
end 

%My code will not link the if-else statements after the first one and I keep getting improperly nested errors

Answer 1

[Steven Lord]

You cannot define a nested function inside an if statement. This is the second item listed in the "Requirements for Nested Functions" section on this documentation page.

Move the definition of the function to the end of your main function if you need it to be nested inside that function or move it after the end of the main function if it doesn't need to be nested.