quantmod | Quantitative Financial Modelling Framework | Cryptocurrency library

I am beginner to R and was hoping to have ideas for making a loop.

I would like to automate the following for each observation out of 726 observation making a 5 ahead out-of-sample forecast based on a rolling window of 1000 obsv, storing only the t+5 in the "pred" column and then reset the "VIX.Close" column to his original values.

I'm running the Getting options chain for multiple tickers but something is wrong with the expiration date for multiple tickers.

Here's a sample code:

I have a 10 year dataset from Tesla returns (2 day difference percentage)

I am having difficulty understanding why the apply.quarterly() function is not really giving me the quarterly returns and returning NA and why my diff(log()) function is also not working with FRED data. Perhaps I am doing something wrong but I cannot really understand what. Could someone help me understand or fix this issue?

The code I use:

How do I add legends to my plot below?

I have a data set something like this:

value <- data.frame(Country = c('AUS', 'AUT', 'GBR'), amount = c(200, 150, 300))

every amount is given in the respectives country currency. So 200 in Aus. Dollar, 150 in Euro and 300 in Pound. What I want at the end is every number converted to the same currency, let's say Euro.

I already found something like library(quantmod) but this only helps with conversion. So I would need to get the currency first only from the country code.

Any Ideas?

I am trying to build a candlestick chart with quantmod and highcharter package. Building the chart is super easy.

I have the following data frame, and try to calculate the returns for each company by using Delt(Adjusted). I have to group by company, so the returns are correct when the row switches to another company and another adjusted price.

I try this code:

"Method" getSymbols.yahoo allows putting a vector in lieu of the Symbols argument allowing the download of several tickers without using a loop: