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 Curious
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  • 0 posts edited
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  • 16 votes cast
Apr
20
revised Integral of ln (3x) / x
added 3 characters in body
Apr
20
accepted Integral of ln (3x) / x
Apr
20
asked Integral of ln (3x) / x
Apr
19
comment Determining half life without logs, given only reduction undergone and total time taken
Yes it is ambiguous. The textbook used in this school is crazy. The teacher thought so as well.
Apr
19
accepted Determining half life without logs, given only reduction undergone and total time taken
Apr
19
comment Determining half life without logs, given only reduction undergone and total time taken
I don't even see what you mean. What you're saying is right - the teacher said the same thing. But I don't understand this. I can recall 2^5 = 32 etc.. but can you please explain in words how is that related to the question. And what does 2^5 and 10/5 relate to in terms of the problem statement? For example, why divide 10 by 5? I can't make the connection.
Apr
19
asked Determining half life without logs, given only reduction undergone and total time taken
Feb
18
awarded  Curious
Feb
17
accepted Explaining the non-application of the multiplication law of logarithms, when logs are in the denominators.
Feb
17
asked Explaining the non-application of the multiplication law of logarithms, when logs are in the denominators.
Nov
9
accepted Solving for x by completing the square in a problem where the solution doesn't seem to have symmetrical answers
Nov
5
asked Solving for x by completing the square in a problem where the solution doesn't seem to have symmetrical answers
May
8
comment Rescaling, or finding logarithmic equivalent of exponential functions
This is the formula I'm actually working with: i.stack.imgur.com/f65Na.png As you can see, if we simplify all the $g_i(stuff)$ and just call it $g$, then this formula isn't exactly $e^x / (1 + e^x)$. It's more like $e^x / (1 + sum(different e^{g(x)s})$. And I'm thinking this isn't serving to properly normalize? Because it's possible that the $g(x)s$ end up negative... and so we might end up with something like $e^{-2} / ( 1 + e^{large number} )$, which may therefore produce a huge number...Am I right? I need the β values as coefficients to build weights for weighted least sq regression.
May
8
comment Rescaling, or finding logarithmic equivalent of exponential functions
One more question - this function - the logistic function, is used for "normalization", right?
May
7
accepted Rescaling, or finding logarithmic equivalent of exponential functions
May
7
comment Rescaling, or finding logarithmic equivalent of exponential functions
So does that mean that the functional values of expression $e^x / (1 + e^x)$ are likely to either be 0, or 1, or anywhere in between?
May
7
asked Rescaling, or finding logarithmic equivalent of exponential functions
May
2
asked Getting the upper and lower quartiles in data with an even number of observations, or where the quartile lands on a decimal number
Feb
20
comment Describing transformations using base vectors
The question said: "Reflection in y-axis"... doesn't that mean a reflection along the line of x=0?
Feb
20
asked Describing transformations using base vectors