ECharts2Shiny | insert interactive charts from ECharts into R Shiny | Data Visualization library

Updated answer

I made some corrections to your code (there were some issues with the curly braces in you if/else statement). Not sure if that is what you intended.

I believe the problem is in the renderPieChart statement:

Just change your event reset to this:

observeEvent(input$reset,{ renderBarChart(div_id = "demo1", grid_left = '1%', direction = "vertical", data = demo) })

Your code is resetting the whole shiny, you only want to reset the plot, if I understood well. Note that your real app will require other tweaks if you did not post your real code.

Resetting the plot can be done with shinyjs to execute the js code: location.reload();

The downloadButton has to have server component to save the data in the given file format.

hope it helps:

I think you cannot use the same "renderTable" server output for all of your UI inputs. AKA, you need to make a separate input and output for your image in the form of a downloadable file. Here is an example of what I did to download a .csv file:

Usually PCA includes centering the data as a Pre Process Step.

PCA only arranges the data in its own Axis (Eigne Vectors) System.
If you use all axis you lose no information.

Yet, usually we want to apply Dimensionality Reduction, intuitively, having less coordinates for the data.
This process means projecting the data into Sub Space which is spanned by only some of the Eigen Vectors of the data.
If one chose wisely the number of vectors one might end up with a significant reduction in the number of dimensions of the data with negligible loss of data / information.
The way to do so is by choosing Eigen Vectors which their Eigen Values sum to most of the data power.