Calculate the first derivative of a plot and the zero-crossings of the derivate.

The image shows

• the original plot in black
• the first derivative in blue
• the second derivative in magenta (the first derivative of the blue plot)
• the zero-crossings of the second derivative

To install the tool save the file plot_tools.ijm under macros/toolsets in your FIJI installation.

Select the plot_tools toolset from the >> button of the ImageJ launcher.

Select a plot-window and press the f-button to create a plot of the first derivative of the original plot.

show zero crossings

If selected, the zero crossings of the derivative are marked in the plot.

• GYTK_sztochiometria_eng.pdf