Merge pull request #998 from plotly/R-heatmap-webgl-doc-update

Created WebGL heatmap doc for R API

Author: priyatharsan

_posts/r/scientific/2018-08-03-heatmap-webgl.Rmd

@@ -0,0 +1,74 @@
+---
+title: WebGL Heatmaps in R | Examples | Plotly
+name: WebGL Heatmaps
+permalink: r/heatmap-webgl/
+description: How to make webGL based heatmaps in R with Plotly.
+layout: base
+thumbnail: thumbnail/heatmap-webgl.jpg
+language: r
+page_type: example_index
+has_thumbnail: true
+display_as: scientific
+order: 20
+output:
+  html_document:
+    keep_md: true
+---
+
+```{r, echo = FALSE, message=FALSE}
+knitr::opts_chunk$set(message = FALSE, warning=FALSE)
+Sys.setenv("plotly_username"="RPlotBot")
+Sys.setenv("plotly_api_key"="q0lz6r5efr")
+```
+
+### New to Plotly?
+
+Plotly's R library is free and open source!<br>
+[Get started](https://plot.ly/r/getting-started/) by downloading the client and [reading the primer](https://plot.ly/r/getting-started/).<br>
+You can set up Plotly to work in [online](https://plot.ly/r/getting-started/#hosting-graphs-in-your-online-plotly-account) or [offline](https://plot.ly/r/offline/) mode.<br>
+We also have a quick-reference [cheatsheet](https://images.plot.ly/plotly-documentation/images/r_cheat_sheet.pdf) (new!) to help you get started!
+
+### Version Check
+
+Version 4 of Plotly's R package is now [available](https://plot.ly/r/getting-started/#installation)!<br>
+Check out [this post](http://moderndata.plot.ly/upgrading-to-plotly-4-0-and-above/) for more information on breaking changes and new features available in this version.
+
+```{r}
+library(plotly)
+packageVersion('plotly')
+```
+
+#### WebGL Heatmap from an Image
+
+```{r, results = 'hide'}
+library("jpeg")
+library("plotly")
+
+# Image processing
+url <- "https://images.plot.ly/plotly-documentation/images/heatmap-galaxy.jpg"
+tmpf <- tempfile()
+download.file(url,tmpf,mode="wb")
+data <- readJPEG(tmpf)
+file.remove(tmpf) # remove the downloaded temp file
+
+zdata = rowSums(data*255, dims = 2)
+
+p <- plot_ly(
+            z = zdata,
+            colorscale = list(c(0,0.5,1),c("blue", "white", "red")),
+            type = "heatmapgl"
+            )
+
+# Create a shareable link to your chart
+# Set up API credentials: https://plot.ly/r/getting-started
+chart_link = api_create(p, filename="heatmap-webgl")
+chart_link
+```
+
+``` {r, echo=FALSE}
+chart_link
+```
+
+#### Reference
+
+See [https://plot.ly/r/reference/#heatmapgl](https://plot.ly/r/reference/#heatmapgl) for more information and options!

_posts/r/scientific/2018-08-03-heatmap-webgl.md

@@ -0,0 +1,74 @@
+---
+title: WebGL Heatmaps in R | Examples | Plotly
+name: WebGL Heatmaps
+permalink: r/heatmap-webgl/
+description: How to make webGL based heatmaps in R with Plotly.
+layout: base
+thumbnail: thumbnail/heatmap-webgl.jpg
+language: r
+page_type: example_index
+has_thumbnail: true
+display_as: scientific
+order: 20
+output:
+  html_document:
+    keep_md: true
+---
+
+
+
+### New to Plotly?
+
+Plotly's R library is free and open source!<br>
+[Get started](https://plot.ly/r/getting-started/) by downloading the client and [reading the primer](https://plot.ly/r/getting-started/).<br>
+You can set up Plotly to work in [online](https://plot.ly/r/getting-started/#hosting-graphs-in-your-online-plotly-account) or [offline](https://plot.ly/r/offline/) mode.<br>
+We also have a quick-reference [cheatsheet](https://images.plot.ly/plotly-documentation/images/r_cheat_sheet.pdf) (new!) to help you get started!
+
+### Version Check
+
+Version 4 of Plotly's R package is now [available](https://plot.ly/r/getting-started/#installation)!<br>
+Check out [this post](http://moderndata.plot.ly/upgrading-to-plotly-4-0-and-above/) for more information on breaking changes and new features available in this version.
+
+
+```r
+library(plotly)
+packageVersion('plotly')
+```
+
+```
+## [1] '4.7.1'
+```
+
+#### WebGL Heatmap from an Image
+
+
+```r
+library("jpeg")
+library("plotly")
+
+# Image processing
+url <- "https://images.plot.ly/plotly-documentation/images/heatmap-galaxy.jpg"
+tmpf <- tempfile()
+download.file(url,tmpf,mode="wb")
+data <- readJPEG(tmpf)
+file.remove(tmpf) # remove the downloaded temp file
+
+zdata = rowSums(data*255, dims = 2)
+
+p <- plot_ly(
+            z = zdata,
+            colorscale = list(c(0,0.5,1),c("blue", "white", "red")),
+            type = "heatmapgl"
+            )
+
+# Create a shareable link to your chart
+# Set up API credentials: https://plot.ly/r/getting-started
+chart_link = api_create(p, filename="heatmap-webgl")
+chart_link
+```
+
+<iframe src="https://plot.ly/~RPlotBot/5461.embed" width="800" height="600" id="igraph" scrolling="no" seamless="seamless" frameBorder="0"> </iframe>
+
+#### Reference
+
+See [https://plot.ly/r/reference/#heatmapgl](https://plot.ly/r/reference/#heatmapgl) for more information and options!