MATLAB Central Discussions - Join the conversation!
メインコンテンツ

Results for


Recently, I came across a post about the JIT compiler on this Korean blog. In the post. The writer discussed the concept of the "Compile Threshold" and how it is calculated.
"The JVM accumulates the number of calls for each method called and compiles when the number exceeds a certain number. In other words, there is a standard for checking how often it is called and then deciding, 'It is time to compile.' This standard is called the compilation threshold. But what is this and why should it be used as a standard?"
The concept of the "Compile Threshold," as used above, seems to be more commonly associated with Tracing just-in-time compilation.
The writer used the simple Java code below to calculate the threshold.
for (int i = 0; i < 500; ++i) {
long startTime = System.nanoTime();
for (int j = 0; j < 1000; ++j) {
new Object();
}
long endTime = System.nanoTime();
System.out.printf("%d\t%d\n", i, endTime - startTime);
}
Since the MATLAB execution engine uses JIT compilation, I just wanted to perform the same experiment that the writer did.
I experimented using simple codes based on the code in the blog. I iterated a function 500 time using for-loop and calculated the execution time for each iteration using tic and toc. Then I plotted the execution time for each loop as blow. First five execution times are much higher than followings (10 times!) The test is very rough so I am not sure that I can conclude "MATLAB has Compile Threshold and it is 5!" but this value is actually correct ;-)
t0 = 0;
tfinal = 10;
y0 = [20;20];
timeToRun = zeros(500,1);
for i = 1:500
tStart = tic;
[preypeaks,predatorpeaks] = solvelotka(t0, tfinal, y0);
tEnd = toc(tStart);
timeToRun(i) = tEnd;
end
VS Code Extension for MATLAB was introduced back in April and has been downloaded 75K times since. Do people here use VS Code for writing MATLAB code?
Matt J
Matt J
Last activity 2024 年 3 月 1 日

Would it be a good thing to have implicit expansion enabled for cat(), horzcat(), vertcat()? There are often situations where I would like to be able to do things like this:
x=[10;20;30;40];
y=[11;12;13;14];
z=cat(3, 0,1,2);
C=[x,y,z]
with the result,
C(:,:,1) =
10 11 0
20 12 0
30 13 0
40 14 0
C(:,:,2) =
10 11 1
20 12 1
30 13 1
40 14 1
C(:,:,3) =
10 11 2
20 12 2
30 13 2
40 14 2
Image Analyst
Image Analyst
Last activity 2023 年 11 月 10 日

Wait for Walter, the rest of us are mere users.
Image Analyst
Image Analyst
Last activity 2023 年 10 月 16 日

MATLAB Training
Image Analyst
Image Analyst
Last activity 2023 年 10 月 16 日

MATLAB Training
Image Analyst
Image Analyst
Last activity 2023 年 10 月 16 日

Mathworks tech support
Image Analyst
Image Analyst
Last activity 2023 年 10 月 16 日

Stand Back. I'm going to try MATLAB.
Image Analyst
Image Analyst
Last activity 2023 年 10 月 16 日

Embarassed by Walter Roberson
Image Analyst
Image Analyst
Last activity 2023 年 10 月 16 日

I use MATLAB.
Image Analyst
Image Analyst
Last activity 2023 年 10 月 16 日

MATLAB Reloaded
Image Analyst
Image Analyst
Last activity 2023 年 10 月 16 日

MATLAB Men
Image Analyst
Image Analyst
Last activity 2023 年 10 月 16 日

Image Analyst
Image Analyst
Last activity 2023 年 10 月 16 日

MATLAB rule!
Image Analyst
Image Analyst
Last activity 2023 年 10 月 16 日

Image Analyst
Image Analyst
Last activity 2023 年 10 月 16 日

MATLAB Road in theaters May 15, 2024.
Image Analyst
Image Analyst
Last activity 2023 年 10 月 16 日

(From "The Exorcist" movie poster)
Image Analyst
Image Analyst
Last activity 2023 年 10 月 16 日

Albert Einstein uses MATLAB
Image Analyst
Image Analyst
Last activity 2023 年 10 月 24 日

Dynamic Field Name shaming
Image Analyst
Image Analyst
Last activity 2023 年 10 月 16 日

We told you "NO!!!"
Go to top of page