if (Double.isNaN(this.minimumRangeValue)) {
                this.minimumRangeValue = minval;
                this.minimumRangeValueRow = r;
                this.minimumRangeValueColumn = c;
            }
            else if (minval < this.minimumRangeValue) {
                this.minimumRangeValue = minval;
                this.minimumRangeValueRow = r;
                this.minimumRangeValueColumn = c;