aherbert commented on code in PR #217:
URL: https://github.com/apache/commons-math/pull/217#discussion_r1001111243
##########
commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/ode/nonstiff/AdamsNordsieckFieldTransformer.java:
##########
@@ -170,10 +170,8 @@ private AdamsNordsieckFieldTransformer(final Field<T>
field, final int n) {
// Nordsieck to multistep, then shifting rows to represent step advance
// then applying inverse transform
T[][] shiftedP = bigP.getData();
- for (int i = shiftedP.length - 1; i > 0; --i) {
- // shift rows
- shiftedP[i] = shiftedP[i - 1];
- }
+ // shift rows
+ if (shiftedP.length - 1 >= 0) System.arraycopy(shiftedP, 0, shiftedP,
1, shiftedP.length - 1);
Review Comment:
Should this be `if (shiftedP.length -1 > 0)` (since we cannot copy length=0).
Please add enclosing braces.
##########
commons-math-transform/src/main/java/org/apache/commons/math4/transform/FastCosineTransform.java:
##########
@@ -181,7 +181,7 @@ private UnaryOperator<double[]> create(final Norm
normalization,
} else {
return normalization == Norm.ORTHO ?
f -> TransformUtils.scaleInPlace(fct(f), Math.sqrt(2d /
(f.length - 1))) :
- f -> fct(f);
+ this::fct;
Review Comment:
Whitespace indentation
##########
commons-math-transform/src/main/java/org/apache/commons/math4/transform/FastSineTransform.java:
##########
@@ -188,7 +188,7 @@ private UnaryOperator<double[]> create(final Norm
normalization,
} else {
return normalization == Norm.ORTHO ?
f -> TransformUtils.scaleInPlace(fst(f), Math.sqrt(2d /
f.length)) :
- f -> fst(f);
+ this::fst;
Review Comment:
Indentation again
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