1. How can I visualise data from a text file?
Go to the 'File' menu->'Import ASCII'->'Single file'
If the file is not imported correctly, change the columns separator using:
'File' menu->'Import ASCII'->'Set import options'
The default columns separator is the TAB.
2. How can I plot data from a table (worksheet)?
Click on the table header to choose the columns to plot and then right click. Chose the 'Plot' option from the pop-up menu and then the type of plot you want.
3. How can I export a plot to an image format?
Right click in the plot window and chose the 'Export' option.
4. Can I export transparent images?
Yes, ".png" images have transparent background.
5. How can I export a text file?
Go to the 'File' menu->'Export ASCII'
6. How can I choose a window using the project explorer?
Double click on the window name will show the window maximized, even if it was hidden before.
7. How can I choose the data range from a plot curve, when doing a curve fit?
Go to the 'Data' menu->'Select data range'. Click in the plot window and use the arrows 'Up' and 'Down' keys to select the curve to analyse. Keeping 'CTRL' button and 'Left' or 'Right' arrow keys pressed simultaneousely permit to move the selected cursor and consequently to modify the data range.
8. Can I fit a plot curve using my own function?
Go to the 'Analysis' menu->'Non-linear Curve Fit...'. Define the function (myFunction=...), enter the initial guesses for the parameters, separated by comas, choose the fitting range and the number of iterations and click 'OK'.
9. Does QtiPlot support greek symbols?
Of course: double click on the text you want to modify and select the text you want to set in greek characters from the dialog window, then press the 'a' button and then 'Apply' or 'OK'.
10. How can I visualize a pixel line profile from an image?
Right click on the image you want to analyse and select the option 'View pixel line profile' from the popup menu. A dialog window opens and allows you to select the number of pixels used for the analysis. Choose a value and click "OK". Then click on the image to select the start point and move your mouse to select an end point while keeping the left button pressed. When you release the left button a plot window appears, representing the pixel intensity versus pixel index.