change the y axis Label interval in core plot - iphone

Question

I implemented core plot library for scatter graph in my app. But I want show the Y Axis Labels like 1.0,2.0,3.0,4.0,5.0,.. and plot the graph accordingly.
When I change the interval of y Label as follow by multiplying with 25 as shown below
NSInteger majorIncrement = 2;
NSInteger minorIncrement = 1;
CGFloat yMax = 10.0f;// should determine dynamically based on max price
NSMutableSet *yLabels = [NSMutableSet set];
NSMutableSet *yMajorLocations = [NSMutableSet set];
NSMutableSet *yMinorLocations = [NSMutableSet set];
for (NSInteger j = minorIncrement; j <= yMax; j += minorIncrement) {
NSUInteger mod = j % majorIncrement;
if (mod == 0) {
CPTAxisLabel *label = [[CPTAxisLabel alloc] initWithText:[NSString stringWithFormat:#"%i", j] textStyle:y.labelTextStyle];
NSDecimal location = CPTDecimalFromInteger(j*25); **//multiply with 25**`
label.tickLocation = location;
label.offset = -y.majorTickLength - y.labelOffset;
if (label) {
[yLabels addObject:label];
}
[yMajorLocations addObject:[NSDecimalNumber decimalNumberWithDecimal:location]];
} else {
[yMinorLocations addObject:[NSDecimalNumber decimalNumberWithDecimal:CPTDecimalFromInteger(j)]];
}
}
y.axisLabels = yLabels;
y.majorTickLocations = yMajorLocations;
y.minorTickLocations = yMinorLocations;
But when the graph is ploted , it shows me wrong.
e.g. if my score is 150 then it start plot as 150/25=6th point.

Answer 1

You can set the orthogonalCoordinateDecimal, To determine the point where your graph starts
CPTXYAxis *y = axisSet.yAxis;
y.orthogonalCoordinateDecimal = CPTDecimalFromFloat(150/25);
further more ,setting the plotRange,
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)graph.defaultPlotSpace;
plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:(150/25) length:25];