code: public SDVariable replaceWhere(SDVariable update, Number value, Condition condition) {
          return replaceWhere(null, update, value, condition);
      }
docs: Element-wise replace where condition:<br>
  out[i] = value if condition(update[i]) is satisfied, or<br>
  out[i] = update[i] if condition(update[i]) is NOT satisfied
  
  @param update    Source array
  @param value     Value to set at the output, if the condition is satisfied
  @param condition Condition to check on update array elements
  @return New array with values replaced where condition is satisfied