I have a dataframe J and I am currently using a code where I am performing some simple operations on this dataframe. The current code is at the end.
What I want to get
There is another dataframe named CFD_L2. This data frame has 3 columns: xpos, ypos, and velocity. Now in the J dataframe, I want to update the fishspeed using the velocity (from the CFD_L2 dataframe based on the xpos and ypos) by adding it to the current fish speed (which is calculated using the distance formula).
So the algorithm steps would go something like this.
- The code will work as it is right now.
- Then the code will go through the J dataframe row by row and check the X.wcentroid..cm. and Y.wcentroid..cm. position and then look for the corresponding xpos and ypos in the CFD_L2 dataframe (it will have to do interpolation in the CFD_L2 to find those exact xpos and ypos as of X.wcentroid..cm. and Y.wcentroid..cm.) and pick the velocity from there and add it to the already calculated fishspeed in the J dataframe.
If someone could help me in building this piece of missing code, I will be very grateful. Thank you in advance. 
#The J dataframe with fish data
J <- read.csv("D:/MSCA-RIBES/Experiments_2021/R/Fish3.csv")
#The dataframe from where I want to extract velocity values and add them to the J dataframe
CFD_L2 <- read.csv(paste0("D:/MSCA-RIBES/Ansys Fluent/L2 Model/2/plane_L2.csv"))
J$fishspeed[1] <- 0 #assigning 0 as the starting fish speed
J$distance <- NA #create the distance column
for (j in 2:nrow(J)) {
#calculating distance from distance formula (both in x and y)
J$distance[j] <- abs(J$X.wcentroid..cm.[j]-J$X.wcentroid..cm.[j-1])
#calculating fish speed in x and y
J$fishspeed[j] <- J$distance[j]/(0.02)
#assigning positive and negative signs to the velocity
J$fishspeed[j] <- ifelse(J$X.wcentroid..cm.[j]-J$X.wcentroid..cm.[j-1] < 0,J$fishspeed[j],-J$fishspeed[j])
}
The MRE for the J dataframe is:
structure(list(frame = 0:9, ACCELERATION.pcentroid..cm.s2. = c(0,
629.05127, 484.44827, 134.24866, 168.38608, 392.61456, 534.75482,
41.96627, 69.14757, 263.45416), ACCELERATION.wcentroid..cm.s2. = c(0,
153.44151, 105.59528, 202.80286, 118.33042, 131.19977, 297.22171,
77.18677, 61.05884, 230.39838), ANGLE = c(3.11237, 3.08248, 3.07114,
-0.10611, -3.11957, 3.14106, -3.10649, -0.083, -0.10303, -0.03427
), ANGULAR_A.centroid = c(0, -202.77382, 3.05533, -7495.91406,
15768.4209, -8005.69336, -236.58276, 7894.97559, -23338.25391,
15657.55469), ANGULAR_V.centroid = c(0, -4.05548, -3.99437, -153.91264,
161.45576, 1.3419, -3.38975, 154.50975, -312.25534, 0.89574),
AX = c(0, -2041.00696, -2051.98926, 2269.85352, -2141.18726,
-2167.49097, -1622.0061, 2030.82153, 2261.80957, 2080.86084
), AY = c(0, 35.52997, 171.27061, -312.76627, -215.38239,
-268.79153, -71.59282, -323.54047, -368.00244, -342.0845),
BORDER_DISTANCE.pcentroid..cm. = c(0.55631, 0.53378, 0.49995,
0.43229, 0.40511, 0.42238, 0.3941, 0.3742, 0.33689, 0.29436
), MIDLINE_OFFSET = c(0.08791, 0.06723, -0.00448, -0.01109,
0.03456, 0.08484, 0.04347, -0.05106, -0.02282, -0.04411),
SPEED.wcentroid..cm.s. = c(0, 3.06883, 4.4169, 3.33479, 1.50971,
2.36096, 3.75872, 2.57346, 2.4795, 3.60654), SPEED.smooth.wcentroid..cm.s. = c(0,
3.06883, 4.4169, 3.33479, 1.50971, 2.36096, 3.75872, 2.57346,
2.4795, 3.60654), SPEED.pcentroid..cm.s. = c(0, 12.58103,
12.6677, 1.91822, 1.10765, 6.40553, 8.74503, 4.52055, 1.54492,
4.30662), SPEED..cm.s. = c(0, 40.82632, 38.38213, 48.67908,
43.71307, 44.80465, 34.20591, 44.49779, 47.65644, 42.92842
), VX..cm.s. = c(0, -40.82014, -38.12928, 48.57462, -43.69948,
-44.57827, -34.06067, 44.18293, 47.29947, 42.68103), VY..cm.s. = c(0,
0.7106, 4.39839, -3.1874, -1.0899, -4.49826, -3.14883, -5.28418,
-5.82202, -4.602), X.wcentroid..cm. = c(24.36773, 24.42594,
24.48949, 24.47197, 24.4474, 24.41499, 24.48632, 24.52759,
24.54886, 24.48055), X..cm. = c(23.48358, 23.55132, 23.66335,
25.46098, 23.59798, 23.55584, 23.73378, 25.36998, 25.47358,
25.40248), speed = c(0, -3.387, -5.6015, -89.8815, 93.15,
2.107, -8.897, -81.81, -5.18, 3.555), Y.wcentroid..cm. = c(29.98473,
30.00418, 30.06554, 30.1299, 30.14745, 30.11311, 30.13684,
30.1676, 30.2124, 30.23556), Y..cm. = c(29.97619, 29.99894,
30, 30, 30, 30, 30, 30, 30, 30), frame.1 = 0:9, midline_length = c(78.90591,
79.62206, 78.76032, 72.85874, 74.39832, 78.09255, 74.34315,
69.12302, 73.73874, 75.47749), midline_x = c(23.15566, 23.22088,
23.33655, 25.76223, 23.28882, 23.23115, 23.42478, 25.65648,
25.7786, 25.71614), midline_y = c(29.98568, 30.01886, 30.11412,
29.96982, 30.09885, 30.05787, 30.03924, 30.00842, 30.02002,
30.11098), missing = c(0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L,
0L), normalized_midline = c(0.1907, 0.08918, -0.12857, Inf,
Inf, 0.1425, Inf, Inf, Inf, 0.00509), num_pixels = c(1376L,
1304L, 1261L, 1165L, 1214L, 1240L, 1198L, 1020L, 917L, 884L
), segment_length = c(0.10935, 0.11035, 0.10918, 0.10098,
0.1031, 0.10823, 0.10307, 0.0958, 0.1022, 0.1046), time = c(0,
0.02, 0.04, 0.06, 0.08, 0.1, 0.12, 0.14, 0.16, 0.18), timestamp = c(0L,
20000L, 40000L, 60000L, 80000L, 100000L, 120000L, 140000L,
160000L, 180000L)), row.names = c(NA, 10L), class = "data.frame")
The MRE for CFD_L2 is:
structure(list(ï..xpos = c(17.3991, 17.9987, 18.5983, 19.1979,
19.7975, 20.3971, 20.9967, 21.5963, 22.1959, 22.7955, 23.3951,
23.9947, 24.5943, 25.1939, 25.7935, 26.3931, 26.9927, 27.5923,
28.1919, 28.7915, 29.3911, 30), ypos = c(30, 30, 30, 30, 30,
30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30,
30), velocity = c(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0)), row.names = 3600:3621, class = "data.frame")
> CFD <- dput(CFD_L2[3000:3621,])
structure(list(ï..xpos = c(24.5943, 25.1939, 25.7935, 26.3931,
26.9927, 27.5923, 28.1919, 28.7915, 29.3911, 30, 0, 0.6104, 1.21,
1.8096, 2.4092, 3.0088, 3.6084, 4.208, 4.8076, 5.4072, 6.0068,
6.6064, 7.206, 7.8056, 8.4052, 9.0048, 9.6044, 10.204, 10.8036,
11.4032, 12.0028, 12.6024, 13.2019, 13.8015, 14.4011, 15.0007,
15.6003, 16.1999, 16.7995, 17.3991, 17.9987, 18.5983, 19.1979,
19.7975, 20.3971, 20.9967, 21.5963, 22.1959, 22.7955, 23.3951,
23.9947, 24.5943, 25.1939, 25.7935, 26.3931, 26.9927, 27.5923,
28.1919, 28.7915, 29.3911, 30, 0, 0.6104, 1.21, 1.8096, 2.4092,
3.0088, 3.6084, 4.208, 4.8076, 5.4072, 6.0068, 6.6064, 7.206,
7.8056, 8.4052, 9.0048, 9.6044, 10.204, 10.8036, 11.4032, 12.0028,
12.6024, 13.2019, 13.8015, 14.4011, 15.0007, 15.6003, 16.1999,
16.7995, 17.3991, 17.9987, 18.5983, 19.1979, 19.7975, 20.3971,
20.9967, 21.5963, 22.1959, 22.7955, 23.3951, 23.9947, 24.5943,
25.1939, 25.7935, 26.3931, 26.9927, 27.5923, 28.1919, 28.7915,
29.3911, 30, 0, 0.6104, 1.21, 1.8096, 2.4092, 3.0088, 3.6084,
4.208, 4.8076, 5.4072, 6.0068, 6.6064, 7.206, 7.8056, 8.4052,
9.0048, 9.6044, 10.204, 10.8036, 11.4032, 12.0028, 12.6024, 13.2019,
13.8015, 14.4011, 15.0007, 15.6003, 16.1999, 16.7995, 17.3991,
17.9987, 18.5983, 19.1979, 19.7975, 20.3971, 20.9967, 21.5963,
22.1959, 22.7955, 23.3951, 23.9947, 24.5943, 25.1939, 25.7935,
26.3931, 26.9927, 27.5923, 28.1919, 28.7915, 29.3911, 30, 0,
0.6104, 1.21, 1.8096, 2.4092, 3.0088, 3.6084, 4.208, 4.8076,
5.4072, 6.0068, 6.6064, 7.206, 7.8056, 8.4052, 9.0048, 9.6044,
10.204, 10.8036, 11.4032, 12.0028, 12.6024, 13.2019, 13.8015,
14.4011, 15.0007, 15.6003, 16.1999, 16.7995, 17.3991, 17.9987,
18.5983, 19.1979, 19.7975, 20.3971, 20.9967, 21.5963, 22.1959,
22.7955, 23.3951, 23.9947, 24.5943, 25.1939, 25.7935, 26.3931,
26.9927, 27.5923, 28.1919, 28.7915, 29.3911, 30, 0, 0.6104, 1.21,
1.8096, 2.4092, 3.0088, 3.6084, 4.208, 4.8076, 5.4072, 6.0068,
6.6064, 7.206, 7.8056, 8.4052, 9.0048, 9.6044, 10.204, 10.8036,
11.4032, 12.0028, 12.6024, 13.2019, 13.8015, 14.4011, 15.0007,
15.6003, 16.1999, 16.7995, 17.3991, 17.9987, 18.5983, 19.1979,
19.7975, 20.3971, 20.9967, 21.5963, 22.1959, 22.7955, 23.3951,
23.9947, 24.5943, 25.1939, 25.7935, 26.3931, 26.9927, 27.5923,
28.1919, 28.7915, 29.3911, 30, 0, 0.6104, 1.21, 1.8096, 2.4092,
3.0088, 3.6084, 4.208, 4.8076, 5.4072, 6.0068, 6.6064, 7.206,
7.8056, 8.4052, 9.0048, 9.6044, 10.204, 10.8036, 11.4032, 12.0028,
12.6024, 13.2019, 13.8015, 14.4011, 15.0007, 15.6003, 16.1999,
16.7995, 17.3991, 17.9987, 18.5983, 19.1979, 19.7975, 20.3971,
20.9967, 21.5963, 22.1959, 22.7955, 23.3951, 23.9947, 24.5943,
25.1939, 25.7935, 26.3931, 26.9927, 27.5923, 28.1919, 28.7915,
29.3911, 30, 0, 0.6104, 1.21, 1.8096, 2.4092, 3.0088, 3.6084,
4.208, 4.8076, 5.4072, 6.0068, 6.6064, 7.206, 7.8056, 8.4052,
9.0048, 9.6044, 10.204, 10.8036, 11.4032, 12.0028, 12.6024, 13.2019,
13.8015, 14.4011, 15.0007, 15.6003, 16.1999, 16.7995, 17.3991,
17.9987, 18.5983, 19.1979, 19.7975, 20.3971, 20.9967, 21.5963,
22.1959, 22.7955, 23.3951, 23.9947, 24.5943, 25.1939, 25.7935,
26.3931, 26.9927, 27.5923, 28.1919, 28.7915, 29.3911, 30, 0,
0.6104, 1.21, 1.8096, 2.4092, 3.0088, 3.6084, 4.208, 4.8076,
5.4072, 6.0068, 6.6064, 7.206, 7.8056, 8.4052, 9.0048, 9.6044,
10.204, 10.8036, 11.4032, 12.0028, 12.6024, 13.2019, 13.8015,
14.4011, 15.0007, 15.6003, 16.1999, 16.7995, 17.3991, 17.9987,
18.5983, 19.1979, 19.7975, 20.3971, 20.9967, 21.5963, 22.1959,
22.7955, 23.3951, 23.9947, 24.5943, 25.1939, 25.7935, 26.3931,
26.9927, 27.5923, 28.1919, 28.7915, 29.3911, 30, 0, 0.6104, 1.21,
1.8096, 2.4092, 3.0088, 3.6084, 4.208, 4.8076, 5.4072, 6.0068,
6.6064, 7.206, 7.8056, 8.4052, 9.0048, 9.6044, 10.204, 10.8036,
11.4032, 12.0028, 12.6024, 13.2019, 13.8015, 14.4011, 15.0007,
15.6003, 16.1999, 16.7995, 17.3991, 17.9987, 18.5983, 19.1979,
19.7975, 20.3971, 20.9967, 21.5963, 22.1959, 22.7955, 23.3951,
23.9947, 24.5943, 25.1939, 25.7935, 26.3931, 26.9927, 27.5923,
28.1919, 28.7915, 29.3911, 30, 0, 0.6104, 1.21, 1.8096, 2.4092,
3.0088, 3.6084, 4.208, 4.8076, 5.4072, 6.0068, 6.6064, 7.206,
7.8056, 8.4052, 9.0048, 9.6044, 10.204, 10.8036, 11.4032, 12.0028,
12.6024, 13.2019, 13.8015, 14.4011, 15.0007, 15.6003, 16.1999,
16.7995, 17.3991, 17.9987, 18.5983, 19.1979, 19.7975, 20.3971,
20.9967, 21.5963, 22.1959, 22.7955, 23.3951, 23.9947, 24.5943,
25.1939, 25.7935, 26.3931, 26.9927, 27.5923, 28.1919, 28.7915,
29.3911, 30, 0, 0.6104, 1.21, 1.8096, 2.4092, 3.0088, 3.6084,
4.208, 4.8076, 5.4072, 6.0068, 6.6064, 7.206, 7.8056, 8.4052,
9.0048, 9.6044, 10.204, 10.8036, 11.4032, 12.0028, 12.6024, 13.2019,
13.8015, 14.4011, 15.0007, 15.6003, 16.1999, 16.7995, 17.3991,
17.9987, 18.5983, 19.1979, 19.7975, 20.3971, 20.9967, 21.5963,
22.1959, 22.7955, 23.3951, 23.9947, 24.5943, 25.1939, 25.7935,
26.3931, 26.9927, 27.5923, 28.1919, 28.7915, 29.3911, 30, 0,
0.6104, 1.21, 1.8096, 2.4092, 3.0088, 3.6084, 4.208, 4.8076,
5.4072, 6.0068, 6.6064, 7.206, 7.8056, 8.4052, 9.0048, 9.6044,
10.204, 10.8036, 11.4032, 12.0028, 12.6024, 13.2019, 13.8015,
14.4011, 15.0007, 15.6003, 16.1999, 16.7995, 17.3991, 17.9987,
18.5983, 19.1979, 19.7975, 20.3971, 20.9967, 21.5963, 22.1959,
22.7955, 23.3951, 23.9947, 24.5943, 25.1939, 25.7935, 26.3931,
26.9927, 27.5923, 28.1919, 28.7915, 29.3911, 30), ypos = c(28.4519,
28.4519, 28.4519, 28.4519, 28.4519, 28.4519, 28.4519, 28.4519,
28.4519, 28.4519, 29.0367, 29.0367, 29.0367, 29.0367, 29.0367,
29.0367, 29.0367, 29.0367, 29.0367, 29.0367, 29.0367, 29.0367,
29.0367, 29.0367, 29.0367, 29.0367, 29.0367, 29.0367, 29.0367,
29.0367, 29.0367, 29.0367, 29.0367, 29.0367, 29.0367, 29.0367,
29.0367, 29.0367, 29.0367, 29.0367, 29.0367, 29.0367, 29.0367,
29.0367, 29.0367, 29.0367, 29.0367, 29.0367, 29.0367, 29.0367,
29.0367, 29.0367, 29.0367, 29.0367, 29.0367, 29.0367, 29.0367,
29.0367, 29.0367, 29.0367, 29.0367, 29.6306, 29.6306, 29.6306,
29.6306, 29.6306, 29.6306, 29.6306, 29.6306, 29.6306, 29.6306,
29.6306, 29.6306, 29.6306, 29.6306, 29.6306, 29.6306, 29.6306,
29.6306, 29.6306, 29.6306, 29.6306, 29.6306, 29.6306, 29.6306,
29.6306, 29.6306, 29.6306, 29.6306, 29.6306, 29.6306, 29.6306,
29.6306, 29.6306, 29.6306, 29.6306, 29.6306, 29.6306, 29.6306,
29.6306, 29.6306, 29.6306, 29.6306, 29.6306, 29.6306, 29.6306,
29.6306, 29.6306, 29.6306, 29.6306, 29.6306, 29.6306, 29.7032,
29.7032, 29.7032, 29.7032, 29.7032, 29.7032, 29.7032, 29.7032,
29.7032, 29.7032, 29.7032, 29.7032, 29.7032, 29.7032, 29.7032,
29.7032, 29.7032, 29.7032, 29.7032, 29.7032, 29.7032, 29.7032,
29.7032, 29.7032, 29.7032, 29.7032, 29.7032, 29.7032, 29.7032,
29.7032, 29.7032, 29.7032, 29.7032, 29.7032, 29.7032, 29.7032,
29.7032, 29.7032, 29.7032, 29.7032, 29.7032, 29.7032, 29.7032,
29.7032, 29.7032, 29.7032, 29.7032, 29.7032, 29.7032, 29.7032,
29.7032, 29.764, 29.764, 29.764, 29.764, 29.764, 29.764, 29.764,
29.764, 29.764, 29.764, 29.764, 29.764, 29.764, 29.764, 29.764,
29.764, 29.764, 29.764, 29.764, 29.764, 29.764, 29.764, 29.764,
29.764, 29.764, 29.764, 29.764, 29.764, 29.764, 29.764, 29.764,
29.764, 29.764, 29.764, 29.764, 29.764, 29.764, 29.764, 29.764,
29.764, 29.764, 29.764, 29.764, 29.764, 29.764, 29.764, 29.764,
29.764, 29.764, 29.764, 29.7641, 29.8149, 29.8149, 29.8149, 29.8149,
29.8149, 29.8149, 29.8149, 29.8149, 29.8149, 29.8149, 29.8149,
29.8149, 29.8149, 29.8149, 29.8149, 29.8149, 29.8149, 29.8149,
29.8149, 29.8149, 29.8149, 29.8149, 29.8149, 29.8149, 29.8149,
29.8149, 29.8149, 29.8149, 29.8149, 29.8149, 29.8149, 29.8149,
29.8149, 29.8149, 29.8149, 29.8149, 29.8149, 29.8149, 29.8149,
29.8149, 29.8149, 29.8149, 29.8149, 29.8149, 29.8149, 29.8149,
29.8149, 29.8149, 29.8149, 29.8149, 29.8149, 29.8575, 29.8575,
29.8575, 29.8575, 29.8575, 29.8575, 29.8575, 29.8575, 29.8575,
29.8575, 29.8575, 29.8575, 29.8575, 29.8575, 29.8575, 29.8575,
29.8575, 29.8575, 29.8575, 29.8575, 29.8575, 29.8575, 29.8575,
29.8575, 29.8575, 29.8575, 29.8575, 29.8575, 29.8575, 29.8575,
29.8575, 29.8575, 29.8575, 29.8575, 29.8575, 29.8575, 29.8575,
29.8575, 29.8575, 29.8575, 29.8575, 29.8575, 29.8575, 29.8575,
29.8575, 29.8575, 29.8575, 29.8575, 29.8575, 29.8575, 29.8575,
29.8931, 29.8931, 29.8931, 29.8931, 29.8931, 29.8931, 29.8931,
29.8931, 29.8931, 29.8931, 29.8931, 29.8931, 29.8931, 29.8931,
29.8931, 29.8931, 29.8931, 29.8931, 29.8931, 29.8931, 29.8931,
29.8931, 29.8931, 29.8931, 29.8931, 29.8931, 29.8931, 29.8931,
29.8931, 29.8931, 29.8931, 29.8931, 29.8931, 29.8931, 29.8931,
29.8931, 29.8931, 29.8931, 29.8931, 29.8931, 29.8931, 29.8931,
29.8931, 29.8931, 29.8931, 29.8931, 29.8931, 29.8931, 29.8931,
29.8931, 29.8931, 29.9228, 29.9228, 29.9228, 29.9228, 29.9228,
29.9228, 29.9228, 29.9228, 29.9228, 29.9228, 29.9228, 29.9228,
29.9228, 29.9228, 29.9228, 29.9228, 29.9228, 29.9228, 29.9228,
29.9228, 29.9228, 29.9228, 29.9228, 29.9228, 29.9228, 29.9228,
29.9228, 29.9228, 29.9228, 29.9228, 29.9228, 29.9228, 29.9228,
29.9228, 29.9228, 29.9228, 29.9228, 29.9228, 29.9228, 29.9228,
29.9228, 29.9228, 29.9228, 29.9228, 29.9228, 29.9228, 29.9228,
29.9228, 29.9228, 29.9228, 29.9228, 29.9476, 29.9476, 29.9476,
29.9476, 29.9476, 29.9476, 29.9476, 29.9476, 29.9476, 29.9476,
29.9476, 29.9476, 29.9476, 29.9476, 29.9476, 29.9476, 29.9476,
29.9476, 29.9476, 29.9476, 29.9476, 29.9476, 29.9476, 29.9476,
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