Dynamic Variables

A dynamic variable is any word that begins and ends with a dollar sign ($). You use this dynamic variable instead of an actual file name in the argument. For example, in the location where you would put the file name of an input image, you might instead put “$input$”, without the double quotes. If you select the checkbox when the text box is empty, the label surrounded by $-signs will be filled in, for example, “$filename$” for “filename”.

The word “input” is merely a word of your choice to remind you of which argument this represents. For example, when taking the ratio of two images, you might use the dynamic variable arguments “$numerator$” and “$denominator$”, or even “$num$” and “$denom$”, anything that will remind you of what the variable represents.

After you have attached the job (“Untitled” in the figure above) to the “exec” module, you can then fill in the arguments to “exec” by left-clicking on the “exec” module. An argument window will appear that has labelled text boxes. The labels that appear next to the text boxes will be the dynamic variables that you defined within the job, “Untitled” as seen above.