how can i dynamically change a file name in dlmwrite?

I am trying to make it so that when a file is uploaded the "name2" of my code will change to match the source file that the data was taken from. Code below.The pieces of code that i want to match are bold and italic.

fid = uigetfile('.dat');

[pathstr, name2 ,ext] = fileparts(fid);

S = importfile(fid); name = S.textdata;

x = S.data(:,1); y = S.data(:,2);

n = length(x);

a = ones(n,1); b = (1:n)'; z = zeros(n,1);

m = [a b x y z ; 1 0 0 0 0];

dlmwrite('coords_ name2 .txt',m,' ')

Answer 1

[Image Analyst]

See this snippet:

% Have user browse for a file, from a specified "starting folder."
% For convenience in browsing, set a starting folder from which to browse.
startingFolder = 'C:\Program Files\MATLAB';
if ~exist(startingFolder, 'dir')
  % If that folder doesn't exist, just start in the current folder.
  startingFolder = pwd;
end
% Get the name of the file that the user wants to use.
defaultFileName = fullfile(startingFolder, '*.*');
[baseFileName, folder] = uigetfile(defaultFileName, 'Select a file');
if baseFileName == 0
  % User clicked the Cancel button.
  return;
end
fullFileName = fullfile(folder, baseFileName)
% Now read it in.

% Now create output name
baseOutputFileName = sprintf('Coords_%s', baseFileName);
fullOutputFileName = fullfile(folder, baseOutputFileName);

[Matthew]

Thanks, here is what i did to make the file change.

clc clear all close all

fid = uigetfile('.dat');

[pathstr,name2,ext] = fileparts(fid);

S = importfile(fid); name = S.textdata;

x = S.data(:,1); y = S.data(:,2);

n = length(x);

a = ones(n,1); b = (1:n)'; z = zeros(n,1);

m = [a b x y z ; 1 0 0 0 0];

filename = sprintf('coords_%s.txt',name2);

dlmwrite(filename,m,' ')

[Image Analyst]

Any reason why you threw out all the things in there that I used to make it more robust? I mean, why write fragile code when you don't have to?