how to repeat a loop until a condition is met than draw histogramm
조회 수: 1 (최근 30일)
이전 댓글 표시
what i want is to generate 2 uniforms randoms numbers 'u1' and 'u2' and evaluate the magnetude of the 2 nummbers .if the magnetude "d<1" it is transformed and scalled by u1 to finally draw a histogramm of the outpout result.
the pgroramm is looks like this .
repeat
u1=2*rand()-1;
u2=2*rand()-1;
d=(u1.^2)+(u2.^2);
until 0<d<1
G=sqrt((-2*log(d))/d);
return G*u1
댓글 수: 0
채택된 답변
Yongjian Feng
2021년 8월 31일
편집: Yongjian Feng
2021년 8월 31일
Just use a while loop?
Try:
done = false;
while ~done
u1=2*rand()-1;
u2=2*rand()-1;
d=(u1.^2)+(u2.^2);
done = d > 0 && d < 1;
end
d
G=sqrt((-2*log(d))/d);
G*u1
추가 답변 (1개)
Image Analyst
2021년 8월 31일
You're not going to be able to generate many points before you get a squared distance of less than 1 and need to quit. I ran it several times and it was always done in the first pass - just was able to get one point. Nonetheless, you need to index your distance so you have an array of distances that you can pass into the histogram() function. Here is how you'd do it:
loopCounter = 1;
maxIterations = 100000; % Failsafe
% Preallocate space
distanceSquared = zeros(1, maxIterations);
while loopCounter <= maxIterations
u1=2*rand()-1;
u2=2*rand()-1;
distanceSquared(loopCounter) = (u1.^2)+(u2.^2);
% See if we need to quit. Quit when distanceSquared is less than 1.
if distanceSquared(loopCounter) < 1
% Crop off unused.
distanceSquared = distanceSquared(1 : loopCounter);
break;
end
loopCounter = loopCounter + 1;
end
caption = sprintf('Was able to generate %d distances.\n', loopCounter);
fprintf('%s\n', caption);
% Compute G from distanceSquared:
G = sqrt((-2*log(distanceSquared)) ./ distanceSquared);
histogram(G);
grid on;
title(caption);
xlabel('G');
ylabel('Count');
댓글 수: 0
참고 항목
카테고리
Help Center 및 File Exchange에서 Creating and Concatenating Matrices에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!