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hi, i want to retreive the y value for the corresponding x-value. i used public double getYValue(int series, int item), a method of XYDataset. when i used that method, Nullpointer exception is thrown. i cant intialise XYDataset,because it is an interface. my x-axis is date and i want the return type...

hi, i want to retreive the y value for the coreesponding x-value. i used public double getYValue(int series, int item), a method of XYDataset. when i used that method, Nullpointer exception is thrown. i cant intialise XYDataset,because it is an interface. my x-axis is date and i want the return type...

I have three field in y-axis(T1,T2,DR) and in x-axis(day). i need to draw a plot b/w day and T1,T2 and DR. i was able to draw the plot. i will get 3 curves.I need to draw the trend line for all the three curves. but i was able to draw trendline for a curve at a time.how to incorporate all the 3 tren...

i need to draw three trend lines in the same chart. is it possible to draw? In my program i have day in the x-axis and 3 parameters in the y-axis.i was able to plot the graph. for the trend line. i need to draw trendline for all the parameter in the y-axia vs x-axis. i was able to draw tend line for...

hi develop, i got the trendline.
thanks for ur help.

my starting date is less than the end date.
but, iam getting the same error what i said before.

thanks for ur suggestion. i was able to convert the date into double when i execute the program, it compiles but during the execution it says some error C:\Program Files\Java\jdk1.5.0_06\bin>java RegressionDemo1 1.1361402E12 1.1361402E12 Exception in thread "main" java.lang.IllegalArgumentException:...

when i was converting dates to double it says inconvertable types. iam using the below function to draw the regression line public static XYDataset sampleFunction2D(Function2D f, double start, double end, int samples, Comparable seriesKey) since my x-axix is date, i need to pass the start and end va...

In regressiondemo1.java, they have created the sample dataset and have passed the vlues. XYDataset regressionData = DatasetUtilities.sampleFunction2D(curve, 2.0, 11.0, 100, "Fitted Regression Line"); in the above method samplefunction, they are passing the starting and end values for the data as 2.0...

hi, iam generating a plot using JFreeChart. In my program, iam getting the values from the database(sql),from the retreived values i will generate the chart.iam using Timeseries plot and XYdataset.i have dates in the x-axis and numbers in the y-axis.for this program i got the plot. but now i need to...