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Old 01-28-2013, 09:34 PM   #31
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Originally Posted by amanda_marie View Post

You cannot divide by 0.

You are not dividing by 0, you are dividing by 4.

How many times 4 goes into 0.

Yes, any number 0/(on this side of the division sign with a 0) will give you 0.

In this case, if it is indeed necessary to divide any result by four, just because your result is 0 would not make it inaccurate.

I see this system, if indeed necessary for this test, making it a little more work to get the right answer.

But do not see why you think it is in accurate.
I don't think I ever said it was inaccurate.
If the result is 0 before dividing it, it's impossible to divide it by 4 because the result would be 0, as I stated in my example.
0/4=0 (unless my calculator on my iPhone is broke).
4/0= Error ( so I'm assuming this is not possible )
Therefore, If the result was 0 before dividing it by 4 yields no other number other than 0 then it is impossible to achieve a result other than 0. And, since you cannot achieve NEGATIVE nitrates it would be impossible to divide it by 4.
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Old 01-28-2013, 10:14 PM   #32
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Is this what yall are referring to (the last line in the "testing tips" section of the API Master Test Kit)?

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Old 01-28-2013, 10:32 PM   #33
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Originally Posted by willbratz View Post
I don't think I ever said it was inaccurate.
If the result is 0 before dividing it, it's impossible to divide it by 4 because the result would be 0, as I stated in my example.
0/4=0 (unless my calculator on my iPhone is broke).
4/0= Error ( so I'm assuming this is not possible )
Therefore, If the result was 0 before dividing it by 4 yields no other number other than 0 then it is impossible to achieve a result other than 0. And, since you cannot achieve NEGATIVE nitrates it would be impossible to divide it by 4.
Its not impossible though, yes the answer will be 0, but its not impossible.

Any number divided into 0 (not by 0) is going to be 0, its just something you know.

Yes 0/4 is 0. But this is not dividing by 0, this is dividing by 4.

4/0 would be dividing by 0, and as I stated you cannot divide by 0, hence the error message.

Again, yes you would get 0 when dividing by four, just like whenever you divide any set numbers there will be a set answer, but that does not make the operation impossible. Just like any math operation has a set answer.

Dividing 4 into 0 does not get you negative, again you get 0. Not impossible as there is an answer. Impossible would be dividing by 0, thats when you get the error message. So you last statement honestly makes no sense.

If it is even necessary to divide for this test, that I have no idea, and 0 is your result you would know it is automatically 0. If the results for this test need to be divided by 0 it would be every result, it wouldn't be said just don't divide 0. Though most people are going to know this will automatically be 0. Just as most people would know that 20/4 is 5. You wouldn't need to sit and figure out the math each time, you would just know.

Basically, if its 0 its still 0 even divided by 4, this doesn't make it impossible though. Just means you would have 0 nitrates.
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Old 01-28-2013, 10:34 PM   #34
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Is this what yall are referring to (the last line in the "testing tips" section of the API Master Test Kit)?
Possibly, I don't know but it's interesting how it says Freshwater aquariums that have had salt added to them. I wouldn't think that would include a marine aquarium, and so I don't think dividing it by 4 applies to a marine aquarium.
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Old 01-28-2013, 10:37 PM   #35
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Possibly, I don't know but it's interesting how it says Freshwater aquariums that have had salt added to them. I wouldn't think that would include a marine aquarium, and so I don't think dividing it by 4 applies to a marine aquarium.
I just got my booklet out for my test, saltwater, and it does say the same.

No idea if it means to divide by four or what though. But if that is from a freshwater test booklet they say the same is all.
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Old 01-28-2013, 10:38 PM   #36
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The saltwater kit reads the same per the API website
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Old 01-28-2013, 10:38 PM   #37
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Originally Posted by amanda_marie View Post

Its not impossible though, yes the answer will be 0, but its not impossible.

Any number divided into 0 (not by 0) is going to be 0, its just something you know.

Yes 0/4 is 0. But this is not dividing by 0, this is dividing by 4.

4/0 would be dividing by 0, and as I stated you cannot divide by 0, hence the error message.

Again, yes you would get 0 when dividing by four, just like whenever you divide any set numbers there will be a set answer, but that does not make the operation impossible. Just like any math operation has a set answer.

Dividing 4 into 0 does not get you negative, again you get 0. Not impossible as there is an answer. Impossible would be dividing by 0, thats when you get the error message. So you last statement honestly makes no sense.

If it is even necessary to divide for this test, that I have no idea, and 0 is your result you would know it is automatically 0. If the results for this test need to be divided by 0 it would be every result, it wouldn't be said just don't divide 0. Though most people are going to know this will automatically be 0. Just as most people would know that 20/4 is 5. You wouldn't need to sit and figure out the math each time, you would just know.

Yes you're
I'm referring to the end result of the test. If the result is 0 to begin with and you cannot achieve NEGATIVE nitrates its impossible to divide it by 4 because the test CANNOT achieve something LESS than 0, which it what it was at ( in my example).
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Old 01-28-2013, 10:44 PM   #38
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So, if your given a color coded scheme to go by, with directions on the back on how to administer the test and how to read the results, why doesn't the back of the card tell you to divide by 4? I think I'll email API and ask the to explain.
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Old 01-28-2013, 10:56 PM   #39
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I don't think the results are suppose to be divided by 4.4. I sent an email to API because I just can't see reading the results via the color card and then dividing by 4.4. Without telling the user they need to divide it.
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Old 01-29-2013, 12:31 AM   #40
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Quote:
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I'm referring to the end result of the test. If the result is 0 to begin with and you cannot achieve NEGATIVE nitrates its impossible to divide it by 4 because the test CANNOT achieve something LESS than 0, which it what it was at ( in my example).
You're talking like it is impossible to divide 0 by 4 and its not. You wouldn't and couldn't get negative by that operation and obviously nitrates could not be negative.

Results say nitrates are 0, then they're 0.

But dividing the 0 result by 4 is 0 still 0. So either way the result is 0, 0 nitrates, whatever. You know 4 into 0 is 0 so theres no need to do the math. 0 is 0.

Just because you are dividing into 0 by 4 doesn't mean it needs to be less than 0 or something, I honestly can't figure out your negative talk and such. Just because its division doesn't mean the answer has to less than the 'result' (in this case).

Its really simple, its just a simple math equation. You don't need to go less than 0 if your result was 0 (just speaking in this case if it even needed to be done). Its just that each result would be divided by 4 in this case of the testing to achieve the correct level of nitrates. Dividing 0 by 4 does not change the results. 0=0 It is not impossible, it isn't inaccurate.
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