Updating equation in formula node from a string or text file

Is it possible to have a calculation performed based on an equation stored in a string (read from a text file). I am guessing not because the equation would need be compiled but thought I would ask.

Hi,
it depends on how complex the equation is.
Rather than using a formula node, you could use the eval formula node vi instead. (Functions->Analyze->Mathematics->Formula), but you may needs to re-organise the text formula a little.
Assuming you're using not the base package, and atleast LabVIEW version 6.1 that shouldn't be a problem.
Hope that helps.
Sacha Emery
National Instruments (UK)
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Marc,
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How can I Cache the data I'm reading from a collection of text files in a directory using a TreeMap? Currently my program reads the data from several text files in a directory and the saves that information in a text file called output.txt. I would like to cache this data in order to use it later. How can I do this using the TreeMap Class?
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TreeMap (Java Platform SE 7 )
Are you sure you want a map and not a tree instead?
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Hi,
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Edited by: Srilatha M on Jun 28, 2011 6:35 AM

Extract specific letters from a string of text

Hello,
I have an idea that I would like to implement into Numbers but I'm not quite sure how to do it, or even if it is possible. What I would like to do is replace a multitude of checkboxes with one cell. In that one cell I will have a string of text, with a letter representing a condition. From this one cell, I would like to be able to extract a certain letter into its own cell and then hide the multitude of cells.
My idea is to eventually just be able to type the conditions into a single cell, extract the letter of the certain condition into another cell, and then extract that information into another table, all the while hiding all of the auxiliary columns in the original table. Because it would be much easier and prettier to simply type a bunch of letters into one box instead of having to check a bunch of boxes, no?
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Let's start with the easy part.
Cells on a Numbers table can contain data entered directly, or can contain a formula. They can't contain both. That means you cannot 'type the conditions into a single cell' in column A ("the left header" cell) AND have a formula which sets that cell to TRUE if the typed in data contains an "A".
There's no problem doing this using column A as the key holder and columns B:Z to hold the TRUE/FALSE results, staring in both cases on row 2.
Here's an example
The column header cells (row 1) contain the letter corresponding to that column.
The row header cells (starting at row 2) contain the 'bunch of letters' you describe. Note (A4) that the letters do not have to be entered in any particular order, and that extraneous characters (eg. a space) are ignored.
The formula shown is entered B2, and filled down and right from there.
=IFERROR(FIND(B$1,$A2)>0,FALSE)
FIND returns the position of the first occurrence of the target string (in this case, the single letter at the top of the column) in the search string, then compares that with the value zero. For any letter that is included in the search string, the find value will be at least 1, so the comparison will return TRUE. If the target letter is not found, FIND returns an error. IFERROR traps this and returns FALSE.
Since the target depends on the letter at the top of the column, all that's needed to extend the range of possible letters to the full alphabet is to enter an A in cell B1, then run through the alphabet A to Z, with Z in cell AA1.
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Regards,
Barry

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hi guys i am having trouble sending records from a database to a .txt file,
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any advice or help will be appreaciated ...tc
=============================================================================================
code:
=============================================================================================
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
import java.math.*;
import javax.swing.border.*;
import java.awt.event.*;
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==========================================================================================================
===========================================================
error:
===========================================================
C:\Users\giga\Desktop>javac DataOut.java
C:\Users\giga\Desktop>java DataOut
java.sql.SQLException: [Microsoft][ODBC Microsoft Access Driver]Invalid characte
r value for cast specification on column number 1 (dds)
at sun.jdbc.odbc.JdbcOdbc.createSQLException(JdbcOdbc.java:6957)
at sun.jdbc.odbc.JdbcOdbc.standardError(JdbcOdbc.java:7114)
at sun.jdbc.odbc.JdbcOdbc.SQLGetDataInteger(JdbcOdbc.java:3811)
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===============================================================
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thx a lot it works...
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i have tried "\n" but it seems not to work..

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http://java.sun.com/j2se/1.5.0/docs/api/java/io/FileReader.html
Convenience class for reading character files. The constructors of this
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Updating equation in formula node from a string or text file

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