Help with "While" loop, not sure what I'm doing
조회 수: 1 (최근 30일)
이전 댓글 표시
I have started learning to use Matlab, I have a program that a colleague of mine has written for processing my data and I can't figure out why some of the script is not working. In the following loop, the first equation (RHlsun) uses the original value of glsuni istead of the new value from the loop. I hope this makes sense. What am I doing wrong?
counter = 0;
glsuni = 0.5;
glsun = 0.0;
converge1 = abs(glsuni - glsun);
while converge1>0.0005;
RHlsun = 1 - (1 - (RH / 100)) .* (((2 * glsuni * ((fgreen * fdry) / fstomata)) .* gvl .* (gbc ./ LAIsun)) ./ ((2 * glsuni .* ((fgreen * fdry) / fstomata)) .* ((2 * glsuni .* ((fgreen * fdry) / fstomata)) .* gvl + (2 * glsuni .* ((fgreen * fdry) / fstomata)) .* (gbc ./ LAIsun) + gvl .* (gbc ./ LAIsun))));
sRHlsun = (sqrt((RHlsun.^2) + (RHlmin^2))) ./ (sqrt(1 + (RHlmin^2)));
CO2lsun = CO2i - (CO2i - CO2a) * (((2 * 0.625 * glsuni * ((fgreen * fdry) / fstomata)) .* gcl .* (gbc ./ LAIsun)) ./ ((2 * 0.625 * glsuni * ((fgreen * fdry) / fstomata)) .* ((2 * 0.625 * glsuni .* ((fgreen * fdry) / fstomata)) .* gcl + (2 * 0.625 * glsuni * ((fgreen * fdry) / fstomata)) .* (gbc ./ LAIsun) + gcl .* (gbc ./ LAIsun))));
glsun = mBWB .* ((Ansun .* sRHlsun) ./ CO2lsun) + bBWB;
counter = counter + 1;
converge1 = abs(glsuni - glsun);
glsuni = glsun;
if counter > 30;
break;
end;
end;
댓글 수: 2
Tom
2012년 8월 16일
That equation is processed before the counter=counter+1 line, so maybe move the counter to the top of the loop?
채택된 답변
Jan
2012년 8월 18일
편집: Jan
2012년 8월 18일
Start with a simplification of the code:
counter = 0;
glsuni = 0.5;
glsun = 0.0;
converge = abs(glsuni - glsun);
c1 = (fgreen * fdry) / fstomata;
c4 = gbc ./ LAIsun;
while converge > 0.0005 || counter > 30
c2 = 2 * glsuni * c1;
c3 = c2 * 0.625;
RHlsun = 1 - (1 - (RH / 100)) ./ (c2 ./ c4 + c2 ./ gvl + 1);
sRHlsun = sqrt(RHlsun .^ 2 + RHlmin ^ 2) ./ sqrt(1 + RHlmin ^ 2);
CO2lsun = CO2i - (CO2i - CO2a) ./ (c3 ./ c4 + c3 ./ gcl + 1);
glsun = mBWB .* Ansun .* sRHlsun ./ CO2lsun + bBWB;
converge = abs(glsuni - glsun);
glsuni = glsun;
counter = counter + 1;
end
Perhaps this allows you to see the problem by your own.
댓글 수: 0
추가 답변 (0개)
참고 항목
카테고리
Help Center 및 File Exchange에서 Loops and Conditional Statements에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!