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Difference between java.util.Random and java.security.SecureRandom
...uter Programming, Volume 3:
Seminumerical Algorithms, section 3.2.1.
Predictability of Linear Congruential Generators
Hugo Krawczyk wrote a pretty good paper about how these LCGs can be predicted ("How to predict congruential generators"). If you're lucky and interested, you may still find a ...
Why does Python code run faster in a function?
...
Aside from local/global variable store times, opcode prediction makes the function faster.
As the other answers explain, the function uses the STORE_FAST opcode in the loop. Here's the bytecode for the function's loop:
>> 13 FOR_ITER 6 (to 22) # ...
What is the difference between LL and LR parsing?
...During an LL parse, the parser continuously chooses between two actions:
Predict: Based on the leftmost nonterminal and some number of lookahead tokens, choose which production ought to be applied to get closer to the input string.
Match: Match the leftmost guessed terminal symbol with the leftmos...
Adding a regression line on a ggplot
... work.
You have to create your line manually as a dataframe that contains predicted values for your original dataframe (in your case data).
It would look like this:
# read dataset
df = mtcars
# create multiple linear model
lm_fit <- lm(mpg ~ cyl + hp, data=df)
summary(lm_fit)
# save predicti...
How to determine the encoding of text?
...
Here is an example of reading and taking at face value a chardet encoding prediction, reading n_lines from the file in the event it is large.
chardet also gives you a probability (i.e. confidence) of it's encoding prediction (haven't looked how they come up with that), which is returned with its p...
Why is processing a sorted array faster than processing an unsorted array?
...
You are a victim of branch prediction fail.
What is Branch Prediction?
Consider a railroad junction:
Image by Mecanismo, via Wikimedia Commons. Used under the CC-By-SA 3.0 license.
Now for the sake of argument, suppose this is back in the 1800s - bef...
MySQL: Large VARCHAR vs. TEXT?
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Can you predict how long the user input would be?
VARCHAR(X)
Case: user name, email, country, subject, password
TEXT
Case: messages, emails, comments, formatted text, html, code, images, links
MEDIUMTEXT
Case: large json bodi...
Why would introducing useless MOV instructions speed up a tight loop in x86_64 assembly?
...ions was an important conditional branch
that branch was being incorrectly predicted due to aliasing in the branch prediction table
moving the branch eliminated the alias and allowed the branch to be predicted correctly
Your Core2 doesn't keep a separate history record for each conditional jump. I...
Why is “while ( !feof (file) )” always wrong?
...es if one has tried to read past the end of file. That means it has little predictive effect: if it is true, you are sure that the next input operation will fail (you aren't sure the previous one failed BTW), but if it is false, you aren't sure the next input operation will succeed. More over, inpu...
How do the likely/unlikely macros in the Linux kernel work and what is their benefit?
...
They are hint to the compiler to emit instructions that will cause branch prediction to favour the "likely" side of a jump instruction. This can be a big win, if the prediction is correct it means that the jump instruction is basically free and will take zero cycles. On the other hand if the predic...