add dependencies to imshow examples

Joseph Damiba · Joseph Damiba · commit cb7074f97cb0 · 2020-03-06T14:05:09.000-05:00
diff --git a/r/2020-02-25-imshow.Rmd b/r/2020-02-25-imshow.Rmd
@@ -33,6 +33,7 @@ fig
 In order to create a numerical array to be passed to `Image` trace, you can use a third-party library like [EBImage](https://www.rdocumentation.org/packages/EBImage/versions/4.14.2) to open an image from a URL.
 
 ```{r}
+library(plotly)
 library(EBImage)
 
 img = readImage('https://upload.wikimedia.org/wikipedia/commons/thumb/0/00/Crab_Nebula.jpg/240px-Crab_Nebula.jpg')
@@ -47,6 +48,7 @@ The default value of `zmin` and [zmax](https://plot.ly/r/reference/#image-zmax)
 
 ```{r}
 library(plotly)
+library(EBImage)
 
 img = readImage('https://upload.wikimedia.org/wikipedia/commons/thumb/0/00/Crab_Nebula.jpg/240px-Crab_Nebula.jpg')
 # Stretch the contrast of the red channel only, resulting in a more red image
@@ -58,6 +60,7 @@ fig
 
 ```{r}
 library(plotly)
+library(EBImage)
 
 img = readImage('https://upload.wikimedia.org/wikipedia/commons/thumb/0/00/Crab_Nebula.jpg/240px-Crab_Nebula.jpg')
 fig <- plot_ly(type="image", z=img*250)
@@ -70,6 +73,7 @@ fig
 ### Combine image charts and other traces
 
 ```{r}
+library(plotly)
 library(EBImage)
 img = readImage('https://upload.wikimedia.org/wikipedia/commons/thumb/0/00/Crab_Nebula.jpg/240px-Crab_Nebula.jpg')
 
