Lab moderna: add p3

Change-Id: I33feba7f04f13e91bfddacfa04a3f5b2e4e1952a
diff --git a/quad12/labmoderna/p3/r/Ra_aire.r b/quad12/labmoderna/p3/r/Ra_aire.r
new file mode 100644
index 0000000..a9217aa
--- /dev/null
+++ b/quad12/labmoderna/p3/r/Ra_aire.r
@@ -0,0 +1,34 @@
+library(tikzDevice)
+
+nom <- 'Ra_aire'
+scale <- 4
+
+table <- read.table(paste0('dades/', nom, '.txt'), sep="\t", dec='.', header=TRUE)
+
+# Plot the data
+plotall <- function() {
+  plot(table$Energy, table$Impulses, type="l", col="#EEEEFF", xlab="Energia (keV)", ylab="Comptes", ylim=c(0, 100))
+  lines(table$Energy, table$ImpulsesSmooth, type="l")
+
+  # Add arrows and text labels to the peaks
+  for (j in 1:nrow(peaks)) {
+    i <- peaks[j, 'indexes']
+    label <- peaks[j, 'labels']
+    arrows(table$Energy[i], table$ImpulsesSmooth[i] + scale*(if (j == 1) 5 else 3), table$Energy[i], table$ImpulsesSmooth[i] + scale*0.1, length = 0.05, code = 1, col = "#514E7E")
+    text(table$Energy[i], table$ImpulsesSmooth[i] + scale*(if (j == 1) 6.6 else 4.6), paste0(table$Energy[i], " keV", "\n", label), col = "#514E7E", cex = 0.75)
+  }
+}
+
+# Els valors dins de c(...) són les files del fitxer de dades.
+# Es resta 2 per trobar els índexs (2 columnes són headers).
+indexes <- c(207, 327, 645) - 2
+labels <- c("\\textsuperscript{210}Po + \\textsuperscript{222}Rn", "\\textsuperscript{218}Po", "\\textsuperscript{214}Po")
+peaks <- data.frame(indexes, labels)
+
+pdf(paste0('output/', nom, '.pdf'), width = 6, height = 5)
+plotall()
+dev.off()
+
+tikz(paste0('output/', nom, '.tex'), width = 6, height = 5)
+plotall()
+dev.off()