Density measurment using cumulative plots

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Zuzana Pániková
Zuzana Pániková 2022-2-27
评论： Zuzana Pániková 2022-3-5
I have two plots
plot(a,b)
hold on
plot(c,d)
and now i need do:

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采纳的回答

Image Analyst
Image Analyst 2022-2-27
Did you try trapz()?

更多回答（3 个）

Zuzana Pániková
a =
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
b
b =
11
6
10
11
23
53
97
138
168
166
172
166
173
184
187
197
191
166
136
97
62
43
27
21
c
c =
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
d
d =
28
28
24
25
55
167
224
272
299
311
334
348
341
368
378
398
367
357
297
236
181
131
99
49
Fackov_po
Fackov_po =
0 11
1 6
2 10
3 11
4 23
5 53
6 97
7 138
8 168
9 166
10 172
11 166
12 173
13 184
14 187
15 197
16 191
17 166
18 136
19 97
20 62
21 43
22 27
23 21
trapz(b,Fackov_po)
ans =
-2006 160
It is correct?
  1 个评论
Image Analyst
Image Analyst 2022-3-2
I don't know. What are the two mat files and the xlsx file in the zip file? Which is yRed, yBlue, and the x values?

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Zuzana Pániková
mat files and xlsx file you don't have to notice, I forgot to delete it.
yRed is d
yBlue is b
x values is a and c.it's the same.
I want to calculate the area between b and d.
Image Analyst
Image Analyst 2022-3-4
One way is to simply sum the curves and subtract them.
area = abs(sum(d) - sum(b));
That assumes there are no negative values, the curves don't cross, and treats the values like a bar chart (bars with flat tops). If you want to treat them like quadilaterals (like bars but slanted tops), you can use trapz().

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