title: Load files only once in R shiny server end
body: <p>If the data file does not change but the model parameter changes, is there any way to only load the data file (uploaded by user) once in shiny server end? This is to say, when the file is uploaded and read by the R code, every time the user change the model parameter through web UI, the code does not reload the data file. I am very new to R shiny. I could not find any example. Thanks! </p>