Checking if a matrix is right dimensions.

I have this code for a user to enter coordinates. This creates then the matrix y and x.

n=10; % number of lines
a= inputdlg('enter x coordinates','test',n)
x=str2num(a{1})
b= inputdlg('enter y coordinates','test',n)
y=str2num(a{1})

I want to make it so that if there is unequal numbers of y and x cordinates a error message is displayed. Would I use if, else statements using the numel command to check if numel of x equalls y.

Thanks,

Answer 1

[Youssef Khmou]

Try

if length(a{1})~=length(b{1})

   error(' Vectors must have same length');
  end

Answer 2

[Image Analyst]

Try this:

numberOfCoordinates = 10; % number of coordinates.
for k = 1 : numberOfCoordinates
  editBoxPrompts{k} = sprintf('Coordinate #%d', k);
end
% celldisp(editBoxPrompts);

% Get x:
caX = inputdlg(editBoxPrompts, 'X coordinates')
x = str2double(caX)
% Get rid of nans (where they didn't enter anything).\
x = x(~isnan(x))

% Get y:
caY = inputdlg(editBoxPrompts, 'Y coordinates')
y = str2double(caY)
% Get rid of nans (where they didn't enter anything).\
y = y(~isnan(y))

% Check for same lengths.
if length(x) ~= length(y)
  warningMessage = sprintf('Error: length of x (%d) does not match length of y (%d)',...
    length(x), length(y));
  uiwait(warndlg(warningMessage));
end

[Giuseppe]

Thanks for the effort I learnt a lot from this.