I'm using the input command, with multiple inputs. I don't want the user to have to re-enter all the inputs if an error occurs.

Here's my script. Thanks :D

%% User Inputs
% Numerous errors are accounted for.
point1=input('Enter the [x,y] coordinate of point 1: ');
if length(point1)~=2
    error('Inputs must be in the form [x,y]')
else 
    point2=input('Enter the [x,y] coordinate of point 2: ');
    if length(point2)~=2
        error('Inputs must be in the form [x,y]')
    elseif point1(1)==point2(1)
        error('Inputs must be non-vertical. (Cannot have the same x-value)')
    else
        point3=input('Enter the [x,y] coordinate of point 3: ');
        if length(point3)~=2
            error('Inputs must be in the form [x,y]')
        elseif point1(1)==point2(1) | point2(1)==point3(1) | point1(1)==point3(1)
            error('Inputs must be non-vertical. (Cannot have the same x-value)')
        else
        end
    end
end

[Walter Roberson]

Add some while loops.

Need2 = true 
while Need2 
  point2 = input(etc) 
  if etc
    Complain
  else
     Need2 = false
  end
end

[Andrew Jones]

im a bit confused regarding your explanation. care to elaborate a little deeper? I'm still a bit of a newbie. Thanks sir

[Stephen23]

Using input like this is a slow way to get input data, and IMO is not a particularly user-friendly way to write code. It also means that functions cannot be automatically tested and makes repeated calls completely impractical.

Consider specifying a config file and importing that, or simply writing a function with clearly specified and tested input/output arguments and leaving it up to the user to decide where their values come from.

Answer 1

[Raj]

I would recommend not to use 'error' as program will stop and exit execution everytime an error occurs. Next time it will always start from beginning and user will have to enter all the values again. Instead, you can use a while loop and just display the message to user. This way program keeps on running till user gives correct value. Once the user gives correct value, move to next level. Something like this:

temp=1;
while temp==1
point1=input('Enter the [x,y] coordinate of point 1: ');
if length(point1)~=2
    disp('Inputs must be in the form [x,y]')
else
    break
end
end
%% Write code to input point 2 and 3 on similar lines.

[Andrew Jones]

you're awesome thank you!