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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()?
Two urns contain 5 white and 7 black balls and 3 white and 9 black balls respectively. One ball is transferred to the second urn and then one ball is drawn from the second urn. Find the probability that the first ball transferred is black, given t..
Describe and assess the evaluation method being used by the testing company
display the value on eight LEDs of the demo board.
What is the role of referential integrity in database relationship window?
Create a high high-level data flow diagram describing the typical traditional methods of renewing a subscription via mail to the print version of a magazine in systems analysis and design methods.
Draw an ER diagram. Make sure each entity type has at least one key attribute. Document any assumptions you make. Avoid diagrams with a single entity. b. If you think the description is incomplete, list other data the database should store. c. Adjust..
Multiple versions of the truth
Write a program in a programming language of your choice to simulate routing using flooding for a network of your choice with at least ten nodes (different from the example in the lecture notes). Each packet should contain a counter that is decrem..
Because modern applications are complex, it is not practical to think about finding and fixing vulnerabilities by simply inspecting the code. Instead, a wide variety of sources-ranging from the government and professional software developers to th..
Is it possible to reduce the number of messages to exactly 2l?
What one characteristic about the Standard Normal Distribution make it different from any normal distribution?
3. How does the CSR program apply to today's trends and current issues in the global marketplace? 4. Whom is the company responsible to? 5. Why should a company implement a CSR program?
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