I believe I have a fundamental misunderstanding of how the isTruthy() function works.
In the below MWE, inputs into the first matrix are summed and plotted straight-line over 10 periods. However this works ONLY IF the matrix 2 creation function is commented-out like in this MWE. When matrix 2 creation is un-commented (matrix 2 does the same thing as matrix 1: inputs are summed and plotted, but plotted as a separate line), matrix 1 inputs are no longer summed and plotted.
The issue appears to lie in if(isTruthy(input$matrix2)){... under the plotData <- reactive({...} function in the server section. I thought if(isTruthy(...) in this context meant if there are manual inputs into matrix 2, then plot matrix 2, otherwise skip ahead to the else{...} and just plot matrix 1. (Note that in the larger App this code is derived from, matrix 2 is rendered in modal dialog, thus the reason why plotting has been broken up this way).
How would I change this code so that matrix 2 is only plotted if there are manual inputs into matrix 2; otherwise plot matrix 1? In order to solve a larger problem I have, I'd like matrix 1 to plot correctly even when matrix 2 is present.
library(dplyr)
library(ggplot2)
library(shiny)
library(shinyMatrix)
sumMat <- function(x){return(rep(sum(x,na.rm = TRUE), 10))}
ui <- fluidPage(
sidebarLayout(
sidebarPanel(
matrixInput("matrix1",
value = matrix(c(60,5), ncol = 2, dimnames = list(NULL,c("X","Y"))),
rows = list(extend = TRUE, delete = TRUE), class = "numeric"),
# matrixInput("matrix2",
# label = "Matrix 2 (Value Y applied in Period X):",
# value = matrix(c(60,5),ncol=2,dimnames=list(NULL,rep("Scenario 1",2))),
# rows = list(extend = TRUE, delete = TRUE),
# cols = list(extend = TRUE, delta = 2, delete = TRUE, multiheader = TRUE),
# class = "numeric"),
),
mainPanel(plotOutput("plot"))
)
)
server <- function(input, output, session){
observeEvent(input$matrix1, {
tmpMat1 <- input$matrix1
if(any(rownames(input$matrix1) == "")){rownames(tmpMat1) <- paste("Row", seq_len(nrow(input$matrix1)))}
updateMatrixInput(session, inputId = "matrix1", value = tmpMat1)
})
plotData <- reactive({
tryCatch(
if(isTruthy(input$matrix2)){
lapply(seq_len(ncol(input$matrix2)/2),
function(i){
tibble(Scenario = colnames(input$matrix2)[i*2-1],
X = seq_len(10),Y = sumMat(input$matrix2[,(i*2-1):(i*2), drop = FALSE]))
}) %>% bind_rows()
} else
{tibble(Scenario = "Scenario 1", X = seq_len(10),Y = sumMat(input$matrix1))},
error = function(e) NULL)
})
output$plot <- renderPlot({
req(plotData())
plotData() %>% ggplot() + geom_line(aes(x = X, y = Y, colour = as.factor(Scenario)))
})
}
shinyApp(ui, server)
See error explanation in CuriousJorge response to Limey comment (incorrect use of isTruthy(), flawed if/then/else logic in the plotData() function).
Note how matrix 1 inputs "downstream" to matrix 2 as scenario 1.
Below is the resolved code:
library(dplyr)
library(ggplot2)
library(shiny)
library(shinyMatrix)
sumMat <- function(x){return(rep(sum(x,na.rm = TRUE), 10))}
ui <- fluidPage(
sidebarLayout(
sidebarPanel(
matrixInput("matrix1",
label ="Matrix 1 (scenario 1):",
value = matrix(c(60,5), nrow = 1, ncol = 2, dimnames = list(NULL,c("X","Y"))),
rows = list(extend = TRUE, delete = TRUE),
class = "numeric"),
matrixInput("matrix2",
label = "Matrix 2:",
value = matrix(c(60,5), ncol = 2, dimnames = list(NULL, rep("Scenario 1", 2))),
rows = list(extend = TRUE, delete = TRUE),
cols = list(extend = TRUE, delta = 2, delete = TRUE, multiheader = TRUE),
class = "numeric")
),
mainPanel(plotOutput("plot"))
)
)
server <- function(input, output, session){
observeEvent(input$matrix1, {
a <- apply(input$matrix2,2,'length<-',max(nrow(input$matrix2),nrow(input$matrix1)))
b <- apply(input$matrix1,2,'length<-',max(nrow(input$matrix2),nrow(input$matrix1)))
c <- if(length(a) == 2){c(b)} else {c(b,a[,-1:-2])}
d <- ncol(input$matrix2)
tmpMat2 <- matrix(c(c), ncol = d)
colnames(tmpMat2) <- paste("Scenario",rep(1:ncol(tmpMat2),each=2,length.out=ncol(tmpMat2)))
if(any(rownames(input$matrix1) == "")){
tmpMat1 <- input$matrix1
rownames(tmpMat1) <- paste("Row", seq_len(nrow(input$matrix1)))
updateMatrixInput(session, inputId = "matrix1", value = tmpMat1)
}
updateMatrixInput(session, inputId = "matrix2", value = tmpMat2)
})
observeEvent(input$matrix2, {
if(any(colnames(input$matrix2) == "")){
tmpMat2 <- input$matrix2
colnames(tmpMat2) <- paste("Scenario",rep(1:ncol(tmpMat2),each=2,length.out=ncol(tmpMat2)))
updateMatrixInput(session, inputId = "matrix2", value = tmpMat2)
}
if(any(rownames(input$matrix2) == "")){
tmpMat2 <- input$matrix2
rownames(tmpMat2) <- paste("Row", seq_len(nrow(input$matrix2)))
updateMatrixInput(session, inputId = "matrix2", value = tmpMat2)
}
input$matrix2
})
plotData <- reactive({
tryCatch(
lapply(seq_len(ncol(input$matrix2)/2),
function(i){
tibble(
Scenario = colnames(input$matrix2)[i*2-1],
X = seq_len(10),
Y = sumMat(input$matrix2[,(i*2-1):(i*2), drop = FALSE])
)
}) %>% bind_rows(),
error = function(e) NULL
)
})
output$plot <- renderPlot({
req(plotData())
plotData() %>% ggplot() +
geom_line(aes(x = X, y = Y, colour = as.factor(Scenario))) +
theme(legend.title=element_blank())
})
}
shinyApp(ui, server)
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