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Questions tagged [geom-raster]

52 questions
7
votes
1 answer

How to change color in R geom_raster?

I am trying to change the color in a heatmap graph. I want the Yellow, Red color scheme instead of the default Blue-Darkblue. My code a=as.matrix(volcano, ncol=ncol(volcano)) row.names(a)= 1:nrow(a) library(reshape2) a1 = melt(a) colnames(a1) =…
Raghav Agarwal
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6
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1 answer

Is there a method to specify geom_raster interpolation range?

I am using R to solve an equation with two variables in R. I am varying the two variables by a sequence and then using geom_raster with interpolation to generate a plot of solutions. However, when I plot the data I noticed that the plot area exceeds…
reedms
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5
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1 answer

How can I remove space/gaps between continuous x-values in geom_raster

I am working with some time-frequency decomposed EEG data and want to produce a spectrogram-like figure using ggplot2. But, I end up with blank spaces between each of my time points. Data <-…
JLC
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4
votes
1 answer

R ggplot - Can't allocate big vector

I'm trying to plot a relatively small data set, and I can't get it to show me the plot. It keeps giving the error Error: cannot allocate vector of size 9.7 Gb. This doesn't make much sense to me as the data set is rather small. > nrow(locs) [1]…
HSchmale
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3
votes
1 answer

Heatmap in r with geom_raster

I am trying to plot a heat map from data with three variables. I am using ggplot with geom_raster, but doesn't seem to work. I am unable to see what's going wrong. library(tidyverse) p <- read.csv("Rheatmaptest.csv", header = TRUE); p xdir …
Samar
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3
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3 answers

ggplot make range of color scale a subset of the range of the data

I'm trying to modify the scale of a heatmap with geom_raster such that the color change occurs over a subset of the data and anything outside that subset doesn't get any more or less colorful. library(tidyverse) library(viridis) library(reshape2) q…
john
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3
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1 answer

Combine coord_proj and geom_raster

I am looking for a means of plotting raster data (using ggplot and geom_raster) on a small scale map. I would like to use ggalt and coord_proj to 'zoom-in' on particular regions of the shapefile, but I run into the error geom_raster only works with…
Nate Miller
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3
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0 answers

How to add geom_line on top of geom_raster plot

I am trying to make the following image in R using geom_raster and geom_line (I made this using each of these separately and photo-shopping the line on top). x is time (days here), y is depth (m), colour is temperature (C) The background colour…
Samwise
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2
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2 answers

geom_raster with colors based on specific discrete values

I'd like to plot a geom_raster with colors based on a specific classification: I tried the following code (variable = SPI) but it didn't work: scale_fill_gradient(colours = c( "brown","burlywood","bisque","aliceblue","cadetblue2","blue"), …
Marcel
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2
votes
1 answer

In scale_fill_gradient, how do you map colours using aesthetics?

I'm making a kind of heatmap using geom_raster, and want to set the intensity using fill, and the colour using scale_fill_gradient. My data is grouped and I'd like to use facet_wrap to split up the plots. I would like the intensity scale (fill) to…
Mike
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2
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1 answer

Tooltip in geom_raster_interactive not returning correct value

I am trying to use geom_raster_interactive in ggiraph to create a map where I can view values of each grid cell using the tooltip function. However, when I set tooltip = value, the tooltip returns the same value for every grid cell in the tooltip. I…
travis belote
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2
votes
1 answer

ggplot2 combine continuous variable and discrete variable in geom_raster

I have a 100 x 100 matrix with two types of elements. The first are continuous variables between 0 and 100 (actually discrete in the program but they represent something that is continuous and should thus have a continuously scaled legend), the…
Michiel uit het Broek
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2
votes
1 answer

Interpolate between logistic regressions with different slope in ggplot geom_raster

Using a simple logistic growth model, I want to plot a contour/gradient based plot showing how the growth parameter (r) changes the slope and asymptotes of the curve. I want to interpolate between the curves plotted instead of just showing a set of…
JMilner
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2
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1 answer

Data Visualisation in R , Sorting the geom_raster()

I have the below data visualisation for life expectancy of Asia using gapminder data-set, How can I change the plot to order it based on countries with higher life expectancy downwards? Here is my code…
Tamra.y
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2
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1 answer

Plot multiple matrices in facets with different x-y axis

I collected the data from a set of online forums and wanted to plot, using ggplot and facets (one facet per forum), the matrix that represent how many times user A replied to user B. Here is the code to load a toy example:…
alberto
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