Manipulation of Array Data

I would like to be able to manipulate some data (columns 2 and 3 of txt file) that I am collecting as a function of time (column 1 of txt file).
Right now, as the VI is running, this data is being plotted on a waveform chart and saved to txt file.
What I need to do is:
Column 1 - Convert each time point to a wavelength. I know starting wavelength (nm) and rate of change of wavelength (nm/sec). I do this conversion on an excel spreadsheet right now where [current wavelength = previous wavelength - rate of change of wavelength*(current time-previous time)]. So how do I extract column one, take the difference between the second value and the first value, and create a new column (somewhere) corresponding to wavelength? And save to a new column?
Column 2 - Need to divide each value by 100 and subtract by a "baseline" (an average of the first 20 points, for instance).
Column 3 - As is.
Final step - Write to file a new column defined as manipulated column 2 divided by column 3 times 100...and then plot this (on y-axis) as a function of manipulated column 1 (x-axis).
It's not incredibly critical that the data manipulation occur in real-time...it can happen after the file has been written if necessary. The final graphical result should look like the attached jpeg.
Thanks in advance for the help - I'm a little uncertain about array conversion, unbundling, etc. nevermind the mathematical differences and averages that need to be obtained.
Meredith
Solved!
Go to Solution.
Attachments:
Example Spectrum.jpg ‏36 KB
Example Spectrum Data.txt ‏323 KB

hello,
i tried to make what i understood , see if it make sense
few textual details in vi, two jpg attached in case your 're not LV8.6
look at xy result to see if that talk to you , not for me
Best regards
Tinnitus
CLAD / Labview 2011, Win Xp
Mission d'une semaine- à plusieurs mois laissez moi un MP...
RP et Midi-pyrénées .Km+++ si possibilité de télétravail
Kudos always accepted / Les petits clicks jaunes sont toujours appréciés
Don't forget to valid a good answer / pensez à valider une réponse correcte
Attachments:
spectrum.vi ‏21 KB
spectum_code.jpg ‏131 KB
specto_xy.jpg ‏123 KB

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OK
While no one responded, I had to think for myself.
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It's good that it works.

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Batya
Solved!
Go to Solution.

OK, here is more detailed information.
I have attached the VI.
This is the code from the "C" file created by right-clicking the CLN and creating a "C" file.
When the parameter in the CLN is set to "array data pointer":
/* Call Library source file */
#include "extcode.h"
int32_t Load_Transmit_FIFO_RTx(uint32_t handle, uint16_t channel,
int32_t FIFOnumber, void data[], int32_t numWords, int32_t *actualLoaded,
int32_t *actualStartIndex);
int32_t Load_Transmit_FIFO_RTx(uint32_t handle, uint16_t channel,
int32_t FIFOnumber, void data[], int32_t numWords, int32_t *actualLoaded,
int32_t *actualStartIndex)
/* Insert code here */
When the parameter is "pointers to handles":
/* Call Library source file */
#include "extcode.h"
/* lv_prolog.h and lv_epilog.h set up the correct alignment for LabVIEW data. */
#include "lv_prolog.h"
/* Typedefs */
typedef struct {
int32_t control;
int32_t data;
} TD2;
typedef struct {
int32_t dimSize;
TD2 data[1];
} TD1;
typedef TD1 **TD1Hdl;
#include "lv_epilog.h"
int32_t Load_Transmit_FIFO_RTx(uint32_t handle, uint16_t channel,
int32_t FIFOnumber, TD1Hdl *data, int32_t numWords, int32_t *actualLoaded,
int32_t *actualStartIndex);
int32_t Load_Transmit_FIFO_RTx(uint32_t handle, uint16_t channel,
int32_t FIFOnumber, TD1Hdl *data, int32_t numWords, int32_t *actualLoaded,
int32_t *actualStartIndex)
/* Insert code here */
When the parameter is set to "handles by value":
/* Call Library source file */
#include "extcode.h"
/* lv_prolog.h and lv_epilog.h set up the correct alignment for LabVIEW data. */
#include "lv_prolog.h"
/* Typedefs */
typedef struct {
int32_t control;
int32_t data;
} TD2;
typedef struct {
int32_t dimSize;
TD2 data[1];
} TD1;
typedef TD1 **TD1Hdl;
#include "lv_epilog.h"
int32_t Load_Transmit_FIFO_RTx(uint32_t handle, uint16_t channel,
int32_t FIFOnumber, TD1Hdl *data, int32_t numWords, int32_t *actualLoaded,
int32_t *actualStartIndex);
int32_t Load_Transmit_FIFO_RTx(uint32_t handle, uint16_t channel,
int32_t FIFOnumber, TD1Hdl *data, int32_t numWords, int32_t *actualLoaded,
int32_t *actualStartIndex)
/* Insert code here */
As to the DLL function, it is a bit more complicated than I explained above, in the current case. My VI calls the function by this name in one DLL, and that DLL loads a DLL and calls a function (with the same name) in the second DLL, which does the work. (Thanks Rolfk, for helping me with that one some time back!)
Here is the code in the first ("dispatcher") DLL:
int borland_dll Load_Transmit_FIFO_RTx(DWORD handle, usint channel, int FIFOnumber, struct FIFO_DATA_CONTROL *data, int numWords, int *actualLoaded, int *actualStartIndex)
t_DispatchTable *pDispatchTable = (t_DispatchTable *) handle;
int retStat = 0;
retStat = mCheckDispatchTable(pDispatchTable);
if (retStat < 0)
return retStat;
if (pDispatchTable->pLoad_Transmit_FIFO_RTx == NULL)
return edispatchercantfindfunction;
return pDispatchTable->pLoad_Transmit_FIFO_RTx(pDispatchTable->handlertx, channel, FIFOnumber, data, numWords, actualLoaded, actualStartIndex);
borland_dll is just "__declspec(dllexport)"
The current code in the DLL that does the work is:
// TEMP
typedef struct {
int control;
int data;
} TD2;
typedef struct {
int dimSize;
TD2 data[1];
} TD1;
typedef TD1 **TD1Hdl;
// END TEMP
int borland_dll Load_Transmit_FIFO_RTx(int handlertx, usint channel, int FIFOnumber, struct FIFO_DATA_CONTROL *data, int numWords, int *actualLoaded, int *actualStartIndex){
struct TRANSMIT_FIFO *ptxFIFO; //pointer to transmit FIFO structure
usint *pFIFOlist; //pointer to array of FIFO pointers to FIFO structures
int FIFOentry, numLoaded;
usint *lclData;
usint nextEntryToTransmit;
// TEMP
FILE *pFile;
int i;
TD1** ppTD = (TD1**) data;
TD1 *pTD = *ppTD;
pFile = fopen("LoadFIFOLog.txt", "w");
fprintf(pFile, "Starting Load FIFO with %d data words, data pointer 0x%x, with the following data&colon; \n", numWords, data);
for (i = 0; i < numWords; i++) {
fprintf(pFile, "%d: control--0x%x, data--0x%x \n", i, data[i].control, data[i].data);
fflush(pFile);
fprintf(pFile, "OK, using CIN generated structures: dimSize %d, with the following data&colon; \n", pTD->dimSize);
for (i = 0; i < numWords; i++) {
fprintf(pFile, "%d: control--0x%x, data--0x%x \n", i, pTD->data[i].control, pTD->data[i].data);
fflush(pFile);
// END TEMP
if ((handlertx) <0 || (handlertx >= NUMCARDS)) return ebadhandle;
if (cardrtx[handlertx].allocated != 1) return ebadhandle;
pFIFOlist = (usint *) (cardrtx[handlertx].segaddr + cardrtx[handlertx].glob->dpchn[channel].tr_stk_ptr);
pFIFOlist += FIFOnumber;
ptxFIFO = (struct TRANSMIT_FIFO *)(cardrtx[handlertx].segaddr + *pFIFOlist);
//use local copy of ptxFIFO->nextEntryToTransmit to simplify algorithm
nextEntryToTransmit = ptxFIFO->nextEntryToTransmit;
//on entering this routine nextEntryToLoad is set to the entry following the last entry loaded
//this is what we need to load now unless it's at the end of the FIFO in which case we need to wrap around
if ( ptxFIFO->nextEntryToLoad >= ptxFIFO->numEntries)
*actualStartIndex = 0;
else
*actualStartIndex = ptxFIFO->nextEntryToLoad;
//if nextEntryToLoad points to the last entry in the FIFO and nextEntryToTransmit points to the first, the FIFO is full
//also if nextEntryToLoad == nextEntryToTransmit the FIFO is full and we exit without loading anything
if (( (( ptxFIFO->nextEntryToLoad >= ptxFIFO->numEntries) && (nextEntryToTransmit == 0)) ||
( ptxFIFO->nextEntryToLoad == nextEntryToTransmit)) && (ptxFIFO->nextEntryToLoad != INITIAL_ENTRY)){
*actualLoaded = 0; //FIFO is full already, we can't add anything
return 0; //this is not a failure, we just have nothing to do, this is indicated in actualLoaded
numLoaded = 0;
lclData = (usint *)data; //must use 16 bit writes to the module
//conditions are dealt with inside the for loop rather than in the for statement itself
for (FIFOentry = *actualStartIndex; ; FIFOentry++) {
//if we reached the end of the FIFO
//if the module is about to transmit the first element of the FIFO, the FIFO is full and we're done
//OR if the module is about to transmit the element we're about to fill in, we're done - the
//exception is if this is the first element we're filling in which means the FIFO is empty
if ((( FIFOentry >= ptxFIFO->numEntries) && (nextEntryToTransmit == 0)) ||
((FIFOentry == nextEntryToTransmit) && (FIFOentry != *actualStartIndex) )){
*actualLoaded = numLoaded;
//set nextEntryToLoad to the end of the FIFO, we'll set it to the beginning next time
//this allows us to distinguish between full and empty: nextEntryToLoad == nextEntryToTransmit means empty
ptxFIFO->nextEntryToLoad = FIFOentry;
return 0;
//we reached the end but can continue loading from the top of the FIFO
if ( FIFOentry >= ptxFIFO->numEntries)
FIFOentry = 0;
//load the control word
ptxFIFO->FifoData[FIFOentry * 3] = *lclData++;
//skip the high of the control word, the module only has a 16 bit field for control
lclData++;
//now put in the data
ptxFIFO->FifoData[(FIFOentry * 3) + 2] = *lclData++;
ptxFIFO->FifoData[(FIFOentry * 3) + 1] = *lclData++;
numLoaded++;
//we're done because we loaded everything the user asked for
if (numLoaded >= numWords) {
*actualLoaded = numLoaded;
ptxFIFO->nextEntryToLoad = FIFOentry+1;
return 0;
//if we reached here, we're done because the FIFO is full
*actualLoaded = numLoaded;
ptxFIFO->nextEntryToLoad = FIFOentry;
fclose (pFile);
return 0;
As you can see, I added a temporary diagnostic with the structures that were created in the "Handles by value" case, and print out the data. I see what is expected, whichever of the options I pick in the CLN!
I understood (from the information in the two links I mentioned in my original post, and from the name of the option itself) that "array data pointer" should pass the array of data itself, without the dimSize field. But that does not seem to be what is happening.
Batya
Attachments:
ExcM4k Load Transmit FIFO.vi ‏15 KB

Array data type in SQL server

Hi there,
I have stored procedure which does have array data type. recently we have migrated oracle to SQL server
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Hi Latheesh,
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what does it contain?
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How do I automatically save array data to a spreadsheet?

I am setting up a 24 hour test where I would like the gathered array data to automatically save to a spreadsheet every 4 hours. Is there a way to set this up with the Write to Spreadsheet file.vi?
Solved!
Go to Solution.

Sure, you just need a timer that will tell you when the 4 hours are up. Take a look at the attached timer, I picked it up on these forums a while ago but I cant remeber who to give credit to for it*. Just use this timer to trigger a case structure holding the write to spreadsheet function.
*It is from Bloomy controls
Message Edited by jmcbee on 03-17-2009 09:39 AM
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Attachments:
Interval Timer.vi ‏21 KB
Delta Time.vi ‏22 KB

I Want to graph useing MSGraph with array data

Hi..
I need to skill to graph using the msgraph with array data
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This #pdfloc data is generated by RMSDK when user highlight (annotation) pdf and keep it in XML format in file system: E.g.
<annotation y="-116" isvisible="False" x="-110" width="220" height="100">
        <dc:identifier>urn:uuid:DF061693-A668-49DF-A20B-DE243C463919</dc:identifier>
        <dc:date>2015-03-02T12:04:53Z</dc:date>
        <dc:creator>creator id</dc:creator>
        <dc:title>Page 4, 02-Mar-2015 5:34 pm</dc:title>
        <target>
            <fragment start="#pdfloc(7f54,3,37,0,0,0,0,1)" end="#pdfloc(7f54,3,37,3,1,0,1,1)">
                <text>by Matt</text>
            </fragment>
        </target>
        <content>
            <dc:date>2015-03-02T12:04:53Z</dc:date>
            <text></text>
        </content>
</annotation>

StringIndexOutOfBoundsException using ARRAY data type

Hi all.
JDK 1.5.0_03, Oracle 9.2.0.4, 9i thin drivers.
I'm trying to use the ARRAY data type to submit a large amount of data to a stored procedure. Unfortunatley I'm getting an error when using the oracleCAllableStatement.setArray method. I've successfully set up my types in the database, and I can create my StructDescriptor and ArrayDescriptor objects but that's as far as I get.
Here's my code:
connection = ConnectionManager.getRawConnection(DatabaseProperties.CSA_DB);
connection.setAutoCommit(false);
ARRAY array = getDatabaseArray(timeSeriesList, date, connection);
String result = new String();
statement = (OracleCallableStatement)connection.prepareCall("{call DATA_LOAD.ARCHIVE_TIMESERIES(?, ?)");
statement.setARRAY(1, array);
statement.registerOutParameter(2, OracleTypes.VARCHAR, result);
statement.execute();
LOG.info(result);
connection.commit();
The line highlighted is where it fails. The exception is below. Unfortunatley its a Java exception rather than a Oracle one so not much help there.
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 40
     at java.lang.String.charAt(Unknown Source)
     at oracle.jdbc.driver.OracleSql.handleODBC(OracleSql.java:123)
     at oracle.jdbc.driver.OracleSql.parse(OracleSql.java:69)
     at oracle.jdbc.driver.OracleConnection.nativeSQL(OracleConnection.java:1181)
     at oracle.jdbc.driver.OracleStatement.expandSqlEscapes(OracleStatement.java:6412)
     at oracle.jdbc.driver.OracleStatement.parseSqlKind(OracleStatement.java:6401)
     at oracle.jdbc.driver.OraclePreparedStatement.<init>(OraclePreparedStatement.java:152)
     at oracle.jdbc.driver.OracleCallableStatement.<init>(OracleCallableStatement.java:77)
     at oracle.jdbc.driver.OracleCallableStatement.<init>(OracleCallableStatement.java:48)
     at oracle.jdbc.driver.OracleConnection.privatePrepareCall(OracleConnection.java:1134)
     at oracle.jdbc.driver.OracleConnection.prepareCall(OracleConnection.java:988)
     at com.db.csa.systems.csa.timeseries.DataArchivedTimeSeriesProvider.archiveTimeseriesForDate(DataArchivedTimeSeriesProvider.java:46)
     at com.db.csa.experiments.TimeseriesArchiver.main(TimeseriesArchiver.java:26)
I'm now completely stuck as short of decompiling the class that's throwing the exception I have no idea what's going on.
Anyone got any ideas?
Thanks, Rob
Message was edited by:
user470390

Hi,
Shouldn't:
statement = (OracleCallableStatement)connection.prepareCall("{call DATA_LOAD.ARCHIVE_TIMESERIES(?, ?)");be this:
statement = (OracleCallableStatement)connection.prepareCall("{call DATA_LOAD.ARCHIVE_TIMESERIES(?, ?)}");i.e. have a closing brace?
- Mark

Why did Fetch waveform Vi generates strange 1D array data(all elements are -5.2)?

I just made some changes on the Getting Startted vi of tkds30xx scope driver to catch the start process of a power supply output(2Vdc). I use Initiate Acquisition vi followed by Fetch waveform vi to get the waveform on scope. I use a logical signal controlled by the Agilent 34903A switch to trigue the waveform acquisition. Then I get the 1D array output from Fetch waveform vi for calculation by another subvi. The waveform sample points are 10E+3 points(default). When running the program, the waveforms on the scope screen are right what I expect, but the 1D array data values are all -5.2V.

Without seeing your code it would be hard to give specifics, but does -5.2V appear anywhere else in the system? One possibility is that you aren't looking at the channel you think you are.
How much delay is there between when you tell the scope to begin acquisition and the read occurs? Could the read be getting its data before the scope actually triggers?
What happens when you run the "Fetch Waveform" vi by itself? In other words, if you setup the system and generate the trigger manually such that the proper waveform is on the scope, does Fetch Waveform run by itself return the proper result?
If this is not correcct there is something basically wrong with the function for reading the waveform. Again, giving specifics are hard, but open the VI and go
through it statement by statement making sure that the settings and commands make sense for your application. Many vendors make excellent instrumentation, but I have yet to see one that could write a good driver.
Also, could you describe what the proper waveform looks like?
Mike...
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How can I alter the way Array data displays?

I can trace the Array data and I get each array item
separated by a comma. How can I replace that comma with a dash so I
show "Index0 - index1 - index2" instead of "Index0, index1, index2"
Thanks!

var myArray:Array = new Array("item1", "item2", "item3");
var reg:RegExp = /,/g;
var arString:String = myArray.toString();
var newString:String = arString.replace(reg, " - ");
trace(newString);

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