Add missing colnames to MA functions

The following functions didn't add column names:

  * HMA()
  * ALMA()
  * WMA()
  * EVWMA()

EVWMA() and WMA() didn't reclass() before the if-statement, so the
colnames weren't added because the dims were always NULL.

The fix to WMA() meant we didn't have to add a reclass() to ALMA() and
HMA(). We just had to set the column name.

Closes #131.

---------
Co-authored-by: Joshua Ulrich <[email protected]>

R/MovingAverages.R

@@ -278,11 +278,14 @@ function(x, n=10, wts=1:n, ...) {
   # replace 1:(n-1) with NAs and prepend NAs from original data
   ma[1:(n-1)] <- NA
 
+  # Convert back to original class
+  ma <- reclass(ma,x)
+
   if(!is.null(dim(ma))) {
     colnames(ma) <- "WMA"
   }
 
-  reclass(ma,x)
+  return(ma)
 }
 
 #-------------------------------------------------------------------------#
@@ -314,12 +317,14 @@ function(price, volume, n=10, ...) {
   # Call C routine
   ma <- .Call(C_evwma, pv[,1], pv[,2], n)
 
+  # Convert back to original class
+  ma <- reclass(ma, price)
+
   if(!is.null(dim(ma))) {
     colnames(ma) <- "EVWMA"
   }
 
-  # Convert back to original class
-  reclass(ma, price)
+  return(ma)
 }
 
 #-------------------------------------------------------------------------#
@@ -380,7 +385,11 @@ function(x, n=20, ...) {
 
   hma <- WMA(madiff, n = trunc(sqrt(n)), ...)
 
-  reclass(hma, x)
+  if(!is.null(dim(hma))) {
+    colnames(hma) <- "HMA"
+  }
+
+  return(hma)
 }
 
 #-------------------------------------------------------------------------#
@@ -409,5 +418,10 @@ function(x, n=9, offset=0.85, sigma=6, ...) {
   for(i in seq_len(NCOL(x))) {
     alma[,i] <- WMA(x[,i], n, wts)
   }
+
+  if(!is.null(dim(alma))) {
+    colnames(alma) <- "ALMA"
+  }
+
   reclass(alma, x)
 }