/**
* Returns compact class host.
*
* @param obj Object to compact.
* @return String.
*/
@Nullable
public static Object compactObject(Object obj) {
if (obj == null) return null;
if (obj instanceof Enum) return obj.toString();
if (obj instanceof String || obj instanceof Boolean || obj instanceof Number) return obj;
if (obj instanceof Collection) {
Collection col = (Collection) obj;
Object[] res = new Object[col.size()];
int i = 0;
for (Object elm : col) res[i++] = compactObject(elm);
return res;
}
if (obj.getClass().isArray()) {
Class<?> arrType = obj.getClass().getComponentType();
if (arrType.isPrimitive()) {
if (obj instanceof boolean[]) return Arrays.toString((boolean[]) obj);
if (obj instanceof byte[]) return Arrays.toString((byte[]) obj);
if (obj instanceof short[]) return Arrays.toString((short[]) obj);
if (obj instanceof int[]) return Arrays.toString((int[]) obj);
if (obj instanceof long[]) return Arrays.toString((long[]) obj);
if (obj instanceof float[]) return Arrays.toString((float[]) obj);
if (obj instanceof double[]) return Arrays.toString((double[]) obj);
}
Object[] arr = (Object[]) obj;
int iMax = arr.length - 1;
StringBuilder sb = new StringBuilder("[");
for (int i = 0; i <= iMax; i++) {
sb.append(compactObject(arr[i]));
if (i != iMax) sb.append(", ");
}
sb.append("]");
return sb.toString();
}
return U.compact(obj.getClass().getName());
}
public static String sampleToString(int[] val, int max) {
if (val == null || val.length < max) return Arrays.toString(val);
StringBuilder b = new StringBuilder();
b.append('[');
max -= 10;
int valMax = val.length -1;
for (int i = 0; ; i++) {
b.append(val[i]);
if (i == max) {
b.append(", ...");
i = val.length - 10;
}
if ( i == valMax) {
return b.append(']').toString();
}
b.append(", ");
}
}
public static float[] div(float[] nums, float n) {
assert !Float.isInfinite(n) : "Trying to divide " + Arrays.toString(nums) + " by " + n; // Almost surely not what you want
for (int i=0; i<nums.length; i++) nums[i] = nums[i] / n;
return nums;
}