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Subsetting rasterstack for subtraction between elements using R?
Correlation between rasters using RStep-by-step: How do I extract Raster values from Polygon overlay with Q-GIS or R?For loops + boxplot for rasterGrid vs. Polygon Overlay in R gives different results than in QGISChanging raster calculation values - shorten this script?Error while comparing two raster layer in RTransforming geostationary satellite image to lon/latMonitoring Progress of projectRaster in RSubset polygon data of SpatialPolygonsDataFrame by Distance to a Set of Coordinates in R?Using spei() function on time series from rasterstack in R?
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
I want ro calculate the differences between rasters within a raster stack with a certain step, and I am unsure how to do so.
What I want is to subtract every element from its 5th next one, something like layer1-layer5, layer5-layer9, layer9 -layer13 and so on.
I tried to use the following to avoid loops but it does not work.
r = raster(matrix(1:30,5,6))
mstack<-stack(r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r)
msub<-subset(mstack, 1:nlayers(mstack)) - subset(mstack, 1:(nlayers(mstack)+5))
r element rasterstack
edited Apr 2 at 21:49
PolyGeo♦
53.9k1781245
asked Apr 2 at 13:31
foofoo
555
add a comment |
I want ro calculate the differences between rasters within a raster stack with a certain step, and I am unsure how to do so.
What I want is to subtract every element from its 5th next one, something like layer1-layer5, layer5-layer9, layer9 -layer13 and so on.
I tried to use the following to avoid loops but it does not work.
r = raster(matrix(1:30,5,6))
mstack<-stack(r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r)
msub<-subset(mstack, 1:nlayers(mstack)) - subset(mstack, 1:(nlayers(mstack)+5))
r element rasterstack
edited Apr 2 at 21:49
PolyGeo♦
53.9k1781245
asked Apr 2 at 13:31
foofoo
555
1
I think you want this:msub < -subset(mstack, 1:(nlayers(mstack)-4)) - subset(mstack, 5:nlayers(mstack))In your second subset you are adding five to the total number of layers which is what is causing the invalid subset error.
– Jacob F
Apr 2 at 13:42
1
Do you also want layer2-layer6? All layer[n]-layer[n+4] for all n such that [n+4]<= total number of layers
– Spacedman
Apr 2 at 14:32
@Spacedman yes, apologies for my english, this is what I try to do but I messed up the subsets.
– foo
Apr 2 at 14:34
1
Do you need to usesubset? Can you directly access layers thus:nl=nlayers(mstack); mstack[[1:(nl-4)]] - mstack[[5:nl]]? You can see the pairs of layers being subtracted withcbind(1:(nl-4), 5:nl)
– Spacedman
Apr 2 at 14:39
Thank you @Spacedman, it took me some hours but it worked! Can you please post this as answer to accept it?
– foo
Apr 3 at 10:20
add a comment |
I want ro calculate the differences between rasters within a raster stack with a certain step, and I am unsure how to do so.
What I want is to subtract every element from its 5th next one, something like layer1-layer5, layer5-layer9, layer9 -layer13 and so on.
I tried to use the following to avoid loops but it does not work.
r = raster(matrix(1:30,5,6))
mstack<-stack(r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r)
msub<-subset(mstack, 1:nlayers(mstack)) - subset(mstack, 1:(nlayers(mstack)+5))
r element rasterstack
edited Apr 2 at 21:49
PolyGeo♦
53.9k1781245
asked Apr 2 at 13:31
foofoo
555
I want ro calculate the differences between rasters within a raster stack with a certain step, and I am unsure how to do so.
What I want is to subtract every element from its 5th next one, something like layer1-layer5, layer5-layer9, layer9 -layer13 and so on.
I tried to use the following to avoid loops but it does not work.
r = raster(matrix(1:30,5,6))
mstack<-stack(r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r,r)
msub<-subset(mstack, 1:nlayers(mstack)) - subset(mstack, 1:(nlayers(mstack)+5))
r element rasterstack
r element rasterstack
edited Apr 2 at 21:49
PolyGeo♦
53.9k1781245
asked Apr 2 at 13:31
foofoo
555
edited Apr 2 at 21:49
PolyGeo♦
53.9k1781245
asked Apr 2 at 13:31
foofoo
555
edited Apr 2 at 21:49
PolyGeo♦
53.9k1781245
edited Apr 2 at 21:49
PolyGeo♦
53.9k1781245
edited Apr 2 at 21:49
PolyGeo♦
53.9k1781245
53.9k1781245
asked Apr 2 at 13:31
foofoo
555
asked Apr 2 at 13:31
foofoo
555
asked Apr 2 at 13:31
foofoo
555
555
1
I think you want this:msub < -subset(mstack, 1:(nlayers(mstack)-4)) - subset(mstack, 5:nlayers(mstack))In your second subset you are adding five to the total number of layers which is what is causing the invalid subset error.
– Jacob F
Apr 2 at 13:42
1
Do you also want layer2-layer6? All layer[n]-layer[n+4] for all n such that [n+4]<= total number of layers
– Spacedman
Apr 2 at 14:32
@Spacedman yes, apologies for my english, this is what I try to do but I messed up the subsets.
– foo
Apr 2 at 14:34
1
Do you need to usesubset? Can you directly access layers thus:nl=nlayers(mstack); mstack[[1:(nl-4)]] - mstack[[5:nl]]? You can see the pairs of layers being subtracted withcbind(1:(nl-4), 5:nl)
– Spacedman
Apr 2 at 14:39
Thank you @Spacedman, it took me some hours but it worked! Can you please post this as answer to accept it?
– foo
Apr 3 at 10:20
add a comment |
1
I think you want this:msub < -subset(mstack, 1:(nlayers(mstack)-4)) - subset(mstack, 5:nlayers(mstack))In your second subset you are adding five to the total number of layers which is what is causing the invalid subset error.
– Jacob F
Apr 2 at 13:42
1
Do you also want layer2-layer6? All layer[n]-layer[n+4] for all n such that [n+4]<= total number of layers
– Spacedman
Apr 2 at 14:32
@Spacedman yes, apologies for my english, this is what I try to do but I messed up the subsets.
– foo
Apr 2 at 14:34
1
Do you need to usesubset? Can you directly access layers thus:nl=nlayers(mstack); mstack[[1:(nl-4)]] - mstack[[5:nl]]? You can see the pairs of layers being subtracted withcbind(1:(nl-4), 5:nl)
– Spacedman
Apr 2 at 14:39
Thank you @Spacedman, it took me some hours but it worked! Can you please post this as answer to accept it?
– foo
Apr 3 at 10:20
1
1
I think you want this:
msub < -subset(mstack, 1:(nlayers(mstack)-4)) - subset(mstack, 5:nlayers(mstack)) In your second subset you are adding five to the total number of layers which is what is causing the invalid subset error.– Jacob F
Apr 2 at 13:42
I think you want this:
msub < -subset(mstack, 1:(nlayers(mstack)-4)) - subset(mstack, 5:nlayers(mstack)) In your second subset you are adding five to the total number of layers which is what is causing the invalid subset error.– Jacob F
Apr 2 at 13:42
1
1
Do you also want layer2-layer6? All layer[n]-layer[n+4] for all n such that [n+4]<= total number of layers
– Spacedman
Apr 2 at 14:32
Do you also want layer2-layer6? All layer[n]-layer[n+4] for all n such that [n+4]<= total number of layers
– Spacedman
Apr 2 at 14:32
@Spacedman yes, apologies for my english, this is what I try to do but I messed up the subsets.
– foo
Apr 2 at 14:34
@Spacedman yes, apologies for my english, this is what I try to do but I messed up the subsets.
– foo
Apr 2 at 14:34
1
1
Do you need to use
subset? Can you directly access layers thus: nl=nlayers(mstack); mstack[[1:(nl-4)]] - mstack[[5:nl]]? You can see the pairs of layers being subtracted with cbind(1:(nl-4), 5:nl)– Spacedman
Apr 2 at 14:39
Do you need to use
subset? Can you directly access layers thus: nl=nlayers(mstack); mstack[[1:(nl-4)]] - mstack[[5:nl]]? You can see the pairs of layers being subtracted with cbind(1:(nl-4), 5:nl)– Spacedman
Apr 2 at 14:39
Thank you @Spacedman, it took me some hours but it worked! Can you please post this as answer to accept it?
– foo
Apr 3 at 10:20
Thank you @Spacedman, it took me some hours but it worked! Can you please post this as answer to accept it?
– foo
Apr 3 at 10:20
add a comment |
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1
I think you want this:
msub < -subset(mstack, 1:(nlayers(mstack)-4)) - subset(mstack, 5:nlayers(mstack))In your second subset you are adding five to the total number of layers which is what is causing the invalid subset error.– Jacob F
Apr 2 at 13:42
1
Do you also want layer2-layer6? All layer[n]-layer[n+4] for all n such that [n+4]<= total number of layers
– Spacedman
Apr 2 at 14:32
@Spacedman yes, apologies for my english, this is what I try to do but I messed up the subsets.
– foo
Apr 2 at 14:34
1
Do you need to use
subset? Can you directly access layers thus:nl=nlayers(mstack); mstack[[1:(nl-4)]] - mstack[[5:nl]]? You can see the pairs of layers being subtracted withcbind(1:(nl-4), 5:nl)– Spacedman
Apr 2 at 14:39
Thank you @Spacedman, it took me some hours but it worked! Can you please post this as answer to accept it?
– foo
Apr 3 at 10:20