Problem with core plot barchart plotting

I am constructing an application that plots a barchart. when i wrote this line

num=(NSDecimalNumber *)[NSDecimalNumber numberWithInt:index];       
return num;

in the meth开发者_开发技巧od

-(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index 

it works properly but i need to pass a float number to plot for that i wrote

num=(NSDecimalNumber *)[NSDecimalNumber numberWithFloat:f1];
return num;

then all of the bars appears together

i tried to adjust the barofset and barwidth but no solution

can anyone help me thanks in advance

Assuming these numbers are for the CPTBarPlotFieldBarLocation field, you need to check the corresponding plot space range (xRange for vertical bars and yRange for horizontal). Make sure the location and length of the plot space range are appropriate for the range of numbers you're returning for this field. It sounds like the length is too large.