Savitzky filter: problem writing to file

Hi,
I have a very weird problem. I m using a Savitzky Golay filter to smooth some data and I can see the correct filtered data on the graph on the front panel. Now, I want to write this filtered data to a file. So I wired the output of the SG filter to a spreadsheet file. On replotting the file, I notice that the graph that I obtain is identical to the input that I gave to the filter. I have attached some screenshots of the front panels and the replotted graph.
Figure one: Is the input to the SG filter
Figure two: Is the output of the SG filter.
Figure three: Is the waveform that I obtained from replotting the output that I wrote to a file.
Figure four: Is the SG filter and write to file VI screenshot.
Can someone please help me out. Its driving me crazy.
Thanks and regards.
Attachments:
sgfilter_writetofile.doc ‏314 KB

You index the output-array of the filter VI before you save it to file. So on the frontpanel you see the whole waveform, but you save only the first value to the file. Another evidendence for this is the messed up x-Axis (time) in the data loaded from your file. The data you see in the file is neither the data before, nor the data after the filter function. You see only the first value of each measurement. YOu have to put a for-loop arround your save to spreadsheet, or better would be to not index the array at all and write the whole array to file. You can use probes to see what I mean.
Hope this helps!
Andre

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Hi,
I'm trying to query my test database (mysql) and to write these results to a file, I manage to get the results out of the database, but when I try to write for instance an int to a file, the file replaces the int by a square. What can be wrong?? The file is created successfully and I've writen the int to the standard out before writing it to the file; in the standard out the int is correct.
code:
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.sql.*;
public class getData extends HttpServlet {
FileWriter fw;
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
response.setContentType("text/html");
java.io.PrintWriter out = response.getWriter();
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
} catch(Exception e){
System.err.println("Database driverclass not found");
Connection conn;
     //insert values into DB
try {
     conn = DriverManager.getConnection("jdbc:mysql://localhost/test?user=admin12&password=adm12");
Statement stmt = conn.createStatement();
String slq = "Select * from feedback";
ResultSet rs = stmt.executeQuery(slq);
if (rs==null){System.out.println("nOT OK");}
else{
try{
File f = new File("D:\\mysql\\Data.txt");
fw = new FileWriter(f);
while(rs.next())
writeToFile(rs.getString(1));
writeToFile(rs.getString(2));
writeToFile(rs.getInt(3));
writeToFile(rs.getInt(4));
writeToFile(rs.getString(5));
writeToFile(rs.getInt(6));
catch(IOException e)
System.out.println("Error occured while writing to file");
stmt.close();
     conn.close();
} catch(SQLException sqle){
System.err.println("A SQL error has occured: " + sqle.getMessage());
/* output your page here*/
out.println("<html>");
out.println("<head>");
out.println("<title>getDataServlet</title>");
out.println("</head>");
out.println("<body>");
out.println("<h2>Data recovered</h2>");
out.println("</body>");
out.println("</html>");
out.close();
fw.flush();
fw.close();
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
processRequest(request, response);
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
processRequest(request, response);
/** Returns a short description of the servlet.
public String getServletInfo() {
return "Short description";
private void writeToFile(int i)
try{
System.out.println("test: "+i);
fw.write(i);
fw.write(";");
}catch(IOException e1)
private void writeToFile(String str)
try{
if (str!=null&&(str.equals("null")==false)){
fw.write(str);
fw.write(";");
}catch(IOException e2)

I would imagine that FileWriter is writing the byte value to the file. Just change your SQL get to this writeToFile(rs.getString(6)); and write it as a String instead of an int.
DesQuite

Savitzky filter: problem writing to file

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