lookup-tables

I'm looking for a nice easy way to find what sectors occupy a given file. My language preference is C#. From my A-Level Computing class I was taught that a hard drive has a lookup table on the first few KB of the disk. In this table there is a linked list for each file detailing what sectors that file occupies. So I'm hoping there's a convinient way to look in this table for a certain file and see what sectors it occupies. I have tried Google'ing but I am finding nothing useful. Maybe I'm not searching for the right thing but I can't find anything at all. Any help is appreciated, thanks.

I am sampling a sine wave at 48 kHz, the frequency range of my sine wave can vary from 0 to 20000 Hz with a step of about 100 Hz. I am using a lookup table approach. So I generate 4096 samples for a sine wave for 4096 different phases. I think the general idea behind this to increment the step size and use different step sizes for different frequncy. So I do the following (pseudo code). But I am not sure how the step size is going to be related to the frequency I want to generate the samples of the sine wave of? For example if my frequency is 15000 Hz what would be the step size that I have to

I've been watching this MSDN video with Brian Beckman and I'd like to better understand something he says: Every imperitive programmer goes through this phase of learning that functions can be replaced with table lookups Now, I'm a C# programmer who never went to university, so perhaps somewhere along the line I missed out on something everyone else learned to understand. What does Brian mean by: functions can be replaced with table lookups Are there practical examples of this being done and does it apply to all functions? He gives the example of the sin function, which I can make sense of,

I found the lookup table here. The table is generated as a reverse bits table of 8 bits. I can not figure out why it works. Please explain the theory behind it. Thanks static const unsigned char BitReverseTable256[256] = { # define R2(n) n, n + 2*64, n + 1*64, n + 3*64 # define R4(n) R2(n), R2(n + 2*16), R2(n + 1*16), R2(n + 3*16) # define R6(n) R4(n), R4(n + 2*4 ), R4(n + 1*4 ), R4(n + 3*4 ) R6(0), R6(2), R6(1), R6(3) }; First off a comment: This kind of thing is normally only done in the IOCCC . Code like this should not be used in production-environments because it is non-obvious . The

I have an excel sheet (data.xlxs) with the following pattern of data with more than 200 rows. NS71282379_67698209 123456001 NS71282379_56698765 123456002 NS71282379_67698209 123456003 . . . Now in my script, I am trying to find the corresponding value for 123456003 as NS71282379_67698209 . In my script, I want to replace 123456003 with its value from the excel sheet. I used xlrd to import the sheet but haven't found any method which easily allows me to find the corresponding value. How can I do this smartly? Haifeng Zhang you can iterate the Excel sheet by range(sheet.nrows) and get row values

A B C 1 PROD1 TYPE1 VAL1 2 PROD2 TYPE1 VAL2 3 PROD1 TYPE2 VAL3 4 PROD2 TYPE3 VAL2 In an empty cell I want to get the value in C column for the Prod Type= Prod2 and type = type3. I will appreciate any kind of help. Adriaan Stander Have a look at using the DGET Excel function. Set A1 = ProdType B1 = Type C1 = Val Then your provided data in A2:C5 Then H1 = ProdType I1 = Type H2 = =PROD2 (Criteria 1) I2 = =TYPE3 (Criteria 2) And lastly, in H3: =DGET(A1:C5,"Val",H1:I2) That should get the value for you. =SUMPRODUCT(($A$1:$A$4="PROD2")*($B$1:$B$4="TYPE3")*($C$1:$C$4)) This assumes that column C

In my Computer Science course, we're learning about Lookup Tables. But our teacher did not provide any examples in the lesson pages he has posted, nor the videos he provided. All he did was tell us what it was but he wants us to use them in our next assignment. But he has failed to give us examples of how to do it. We were learning about Arrays before we got into Lookup Tables. Can someone Tell me what a Lookup Table is? (Lots of details please?) Provide some examples of a Lookup Table? We're supposed to use Arrays? You can use a map to store key/value pairs and lookup a value by it's key: Map