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When creating the two data frames in the function, we extract a subset of values from each record, create a matrix and then a data frame. This essentially involves creating at least 3 copies of the relevant values in memory. What are they? Are there better ways to do this? Consider the time, x, y data frame, for example. We could use l apply (), rather than sapply(), to return a list of vectors (say, list Of Vectors) of length 3. We could then use as data frame (do call (rbind, list Of Vectors)) to create the data frame. Does this reduce the amount of memory used? Are there other ways to arrange the computations to avoid having 3 copies of the data in memory at once? If so, are these faster or slower than our approach above in read Log()?
Suppose a car can run on ethanol and gas and you have a 15 gallons tank to fill. You can buy fuel that is either 30 percent ethanol or 80 percent ethanol. How much of each type of fuel should you mix so that the mixture is 40 percent ethanol?
M is an N-by-N matrix in which the entries in each rows are in increasing order and the entries in each column are in increasing order (reading top to bottom). Consider the problem of determining if x is inM using three-way comparisons (i.e., one ..
Design an ER schema for keeping track of information about votes taken in the U.S. House of Representatives during the current two-year congressional session
You are the IT director for XYZ Manufacturing. Your company is a B2B (business-to-business) organization that supplies auto parts to General Motors. There are 200 employees at XYZ Manufacturing with a headquarters in Detroit, Michigan, and field offi..
Identify 5 detailed security requirements that should be added to list 2 based upon policy statements in list 1 that are NOT covered by entries already present in list 2.
Discover the site which you feel is poorly designed and describe what modifications must be made using text as a guide.
What are the benefits of creating a modular design for a large computer program? Why would one extremely large program not be the best choice for a quality program design?
Print a header line with appropriate labels for each column. Format each data line to vertically align each column right-justified.
explain why its difficult to support direct assess to files with variable length records. suggest a method for handling this type of file if direct access is required.
Write a Java program which defines unconstrained array of user defined length n (the value of n is to be taken from a proper user's input). Fill in the array with n random numbers.
Read the case study titled "A Patient Information System for Mental Health Care", located in Chapter 1 of your textbook. Develop an overall architecture for the system described in the assigned reading
Research new network observation tools that use enhanced techniques, such as virtual machine-based code execution, to detect unwanted network traffic (e.g., botnet activity or malware activity that is not detectable by traditional Anti-virus techniqu..
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