ECLIPSE question...what am i doing wrong???

hi, i downloaded Eclipse 3.1 recently and i started playing with it today. I noticed
right away, though, that there is something strange and maybe I have some
settings I need to adjust. I have a project called 'LOG' that sits in the root
workspace directory. In that project is a class called LOG.
Now, I created another project called 'practice'. In that project I have 2 classes:
The first is a class called practice1, which is in NO package, it is just by itself in
the project.
The second is a class called practice2, which resides in a package IN the
practice project.
The problem is that I added the 'LOG' project to my build path, but only practice1 can see it! I never had that problem in Eclipse 2.1. In that version if I loaded project B
into project A, then all classes in project A could see classes in project B.
Anyways, does understand where i am going awry? I would appreciate it.
Thanks, Peter

yawmark, what exactly is a namespace, and what is the default namespace?
Also, if it is what i think it is, then it makes sense even if for nothing else than
organizational purposes. I have written a swing app for my work that has turned
from a simple class that does a few things to doing TONS of stuff. It relies on
20-25 other classes to get the JAR file ready. I didn't understand the virtues of
packages until recently. My JAR has gotten progressively more and more difficult
to put together. Now i am going to just bite the bullet and go around and package
up all my classes! I should've done this a LONG time ago!

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What am I doing wrong with this filter (counter/frequency issue), probably another newb question.

I extracted the part of my VI that applies here. I have a 6602 DAQ board reading a counter for frequency, using a Cherry Corp proximity sensor. Getting a lot of noise and errant ridiculously high readings. Speed of shaft which it's measuring is currently 2400rpm with one pulse per revolution so 40hz.
Trying to use the express filter VI to clean up the signal and ignore anything over, say, 45hz and under 35hz. No matter what setting I choose I continually get the 20020 error, Analysis: The cut-off frequency, fc, must meet: 0 <= fc <= fs/2. I know this relates to sample period somehow, but for the life of me I can't understand what I'm doing wrong.
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VI attached
Still confused after 8 years.
Attachments:
RPM.vi ‏92 KB

Hello Ralph,
I'm not sure about mounting your sensor to your rig, but I can provide a couple ideas about the filtering. Depending on the type of noise, the digital filters on the PCI-6602 could help eliminate the behavior you are seeing. If the noise manifests as a "glitches" or a bouncing signal, you could use another counter with a minimum period to help eliminate the noise. This concept is discussed in greater detail in this KnowledgeBase. I noticed that you are using NI-DAQmx; the practical application of the digital filters on the PCI-6602 in NI-DAQmx is discussed in this KnowledgeBase. A more detailed description of the behavior of these filters is provided in the NI-DAQmx Help (Start>>All Programs>>National Instruments>>NI-DAQ) in the book entitled "Digital Filtering Considerations for TIO-Based Devices".
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Error -20020 occurred at an unidentified location
Possible reason(s):
Analysis: The cut-off frequency, fc, must meet: 0 <= fc <= fs/2.
I think you may have misunderstood exactly what the Filter express VI does. The Filter express VI takes a series of values in a waveform and performs filtering on those signals. So, it will look at a waveform made up of X and Y values and apply the defined filter to this waveform. Specifically in your application, the cut-off frequency (fc) is the Upper Cut-Off level that you specified in the Filter express VI; any frequency components of the waveform outside of the range you have defined will be filtered. The fs is the sample rate based on the data that you wire to the Signal input of the Filter express VI. In your VI, this data is coming from the DAQ Assistant. So, fs will be the sample rate of the DAQ Assistant and is associated with the rate at which points are acquired. The sample rate does NOT relate to the bandwidth of the signal, except that the Nyquist theorem tells us that the sample rate must be at least twice the signal bandwidth in order to determine periodicity of the signal. So, in this case, the sample rate of the DAQ Assistant would need to be at least double the high cut-off frequency.
However, you are performing a frequency measurement using a counter. I think this is where the confusion comes in. For the frequency measurement using a counter, the DAQ Assistant returns a decimal value which represents the rate of the pulse train being measured by the counter. It does not return the actual waveform that is being read by the counter. It is this waveform that would be band-pass filtered to eliminate frequency content outside of the filter's bandwidth. Instead of the Filter express VI, I would recommend that you simply discard values that are outside the range you specify. I have modified the code you posted earlier to perform this operation. The image below shows the changes that I made; rather than using the Filter express VI, I simply compare the frequency to the "Low Threshold" and "High Threshold". I use a Case structure to display the value on if it is within the limits. Otherwise, I display a "NaN" value. I have also attached the modified VI to this post.
Message Edited by Matt A on 09-04-2007 07:58 PM
Matt Anderson
Hardware Services Marketing Manager
National Instruments
Attachments:
RPM (Modified).JPG ‏17 KB
RPM (modified).vi ‏72 KB

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symbol : method JOptionPane(java.lang.String)
location: class Investment
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symbol : method JOptionPane(java.lang.String)
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C:\Java\Investment.java:22: cannot find symbol
symbol : variable Int
location: class Investment
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Edited by: Close on Oct 23, 2007 4:12 PM

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