# How can I calculate the areas between these two curves?

조회 수: 14 (최근 30일)
Jose Aroca . 2020년 7월 15일
댓글: Jose Aroca . 2020년 7월 26일
I need to calculate both areas A and B that lie between these two curves. The curves are extracted form two text files, which are attatched. The code below shows how the graph is produced.
close all
clearvars
plot (DM{:,1},DM{:,2})
hold on
AF = readtable('Alexa Fluor 647 - Em.txt');
plot (AF{:,1},AF{:,2})
A = intersect(DM{:,1}, AF{:,1});
xlim ([500 900])
hold on
AArea = trapz(AF{:,1},AF{:,2});
DMArea = trapz(DM{:,1},DM{:,2}); 댓글을 달려면 로그인하십시오.

### 답변 (1개)

To calculate the area B change the follwing line of code
AArea = trapz(AF{:,1},AF{:,2});
to
AArea = abs(trapz(AF{:,1},(AF{:,2} - DM{:,2} )));
and to compute area A calculate the area under the AF and subtract AArea from it
DMArea = abs(trapz(AF1{:,1},AF{:,2} - AArea);
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Jose Aroca 2020년 7월 26일
Hi. First of allm thank you for your answer. I have tried adding your suggestions but I don't think I get the correct answer. I get an area for B of about 490, when it should be about 20.5, and therefore the area calculated for A is also wrong. I am not sure how to correct this.

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