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We have also clarified that C10 carbon ring is less reactive object compared to the other studied carbon rings.
Every time input from a widget changes, the value for the reactive object updates to reflect this change.
The names of output objects are not seen by users and *Output functions do not take label arguments; therefore, headings or titles need to be built into the expression for the reactive object in server.R or a heading element in ui.R.
An element, such as plotCONC, defining a ggplot2 5 object is defined within the shinyServer braces (outside the reactive expression) as: output$plotCONC <- renderPlot({ plotobj <- ggplot sim.data + … + … print plotobj) }) Each output object requires a render* function that corresponds to the type of reactive object needed to be made.
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As discussed in Example 1, reactive objects are required to be enclosed within a render* function or a reactive expression.
Some applications require more complex processing of multiple reactive objects and data, that when placed inside render* braces significantly slow the application's re-evaluation of the output.
In this application (Example 2), a data frame of time and concentrations at each time-point is constructed from reactive objects controlled by user-input widgets surrounded by reactive braces (just like a render* function).
Expressions for defining and processing reactive objects are required to be enclosed within a render* function (for returning reactive output to the user-interface, where * denotes an object description such as "plot," "table," or "text") or a reactive expression (often for controlling a, or series of, reactive data frames that can be sent to the user-interface by render* functions).
For creating a reactive text object, the structure of the previous code can be followed using renderText in place of renderTable in server.R. Shiny applications can use R packages such as deSolve 12 (differential equation solver) to represent population models as differential equations.
Shiny *Output functions call reactive R objects defined in server.R to the user-interface, where * denotes an object description such as "plot," "table," or "text".
The renderPlot function containing reactive input objects (KA, KE, and V from sliders), expressions for calculating concentration (CONC), and a ggplot2 5 object plotting resultant concentrations over time (plotobj), will re-execute with every reaction to a widget change and will store the updated plot object as plotCONC for the output object.
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