How I ignore the unnecessary areas between two graphs in my Plot?

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Denis Paul
Denis Paul 2020-6-29
评论： Shojiro SHIBAYAMA 2020-6-29
Hello,
I want to color the areas between the two graphs like it is. The interesting part is the big green area. Sometimes i get a little green area between the big areas. My question is "How i can ignore the little areas"?
Pressure = readtable("Part1.txt","Delimiter",'space',"DecimalSeparator",",","ReadVariableNames",false);
Tabpressure = Pressure(:,4:5);
Tabpressure.Properties.VariableNames{1} = 'LV';
Tabpressure.Properties.VariableNames{2} = 'LA';
Ventricel = (Tabpressure{:,"LV"})';
Atrium = (Tabpressure{:,"LA"})';
Time = (1:length(Ventricel));
plot(Time,Ventricel,'r',"LineWidth",1);
hold on
plot(Time,Atrium,'g',"LineWidth",1);
Timearea = [Time; Time];
BothCurves = [Atrium; min([Ventricel;Atrium])];
surf(Timearea,BothCurves,Timearea*0,'edgecolor','none','facecolor','g');
hold off
  1 个评论
darova
darova 2020-6-29
I think solution would too complicated. What about this simple trick?
BothCurves = [Atrium-1000; min([Ventricel;Atrium-1000])];

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回答（1 个）

Shojiro SHIBAYAMA
Shojiro SHIBAYAMA 2020-6-29
编辑：Shojiro SHIBAYAMA 2020-6-29
How about you ignore the indexes of both x `Time` and y `Ventricel` and `Atrium`?
Define `THRESHOLD` as you wish and you recognize as 'ignorable'.
onFocus = Atrium >= Ventricel & abs(Atrium - Ventricel) >= THRESHOLD;% returns boolean
So the final code will be:
Pressure = readtable("Part1.txt","Delimiter",'space',"DecimalSeparator",",","ReadVariableNames",false);
Tabpressure = Pressure(:,4:5);
Tabpressure.Properties.VariableNames{1} = 'LV';
Tabpressure.Properties.VariableNames{2} = 'LA';
Ventricel = (Tabpressure{:,"LV"})';
Atrium = (Tabpressure{:,"LA"})';
onFocus = Atrium >= Ventricel & abs(Atrium - Ventricel) >= THRESHOLD;% returns boolean
Time = (1:length(Ventricel));
plot(Time(onFocus),Ventricel(onFocus),'r',"LineWidth",1); % keep onFocus==true variables
hold on
plot(Time(onFocus),Atrium(onFocus),'g',"LineWidth",1); % keep onFocus==true variables
Timearea = [Time; Time];
BothCurves = [Atrium; min([Ventricel;Atrium])];
surf(Timearea,BothCurves,Timearea*0,'edgecolor','none','facecolor','g');
hold off
Good luck!
  2 个评论
madhan ravi
madhan ravi 2020-6-29
I revived your answer from spam quarantine. Perhaps it’s because you used those apostrophes it may have gone to the spams.
Shojiro SHIBAYAMA
Shojiro SHIBAYAMA 2020-6-29
Okay, thank you! I'm used to markdown grammar and tend to use apostrophes. I'll avoid them in future.

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