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Missing image.equation function from imagej-ops #287
Description
I'm working through converting the ImageJ/Fiji script templates to use SciJava Ops. The Richardson-Lucy Total Variation deconvolution imagej-ops Groovy script uses the equation function in the image namespace to create a grid image:
grid_img = ops.run("create.img", [x_dim, y_dim], new FloatType())
formula = "p[0]^2 * p[1]"
ops.image().equation(grid_img, formula)If I remember correctly the equation function depends on JavaScript (Nashorn) which may complicate things. I'm not necessarily advocating that we add this to SciJava Ops, and as I understand it this is not a highly used function.
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gselzer commentedon May 26, 2026
Your memory is correct! Here's the commit where it was deleted.
I think this could actually be a fun Op to write. You could imagine an Op that:
apply, simply returns aFunctionRandomAccessiblewhoseBiConsumer:Mapmappingp[n]to the n-th dimension of theLocalizableexpression.evalctrueden commentedon May 26, 2026
I pushed a branch implementing
image.equationwith Parsington. All tests pass when compiled, including newly crafted unit tests, but I was unable to test manually in IntelliJ, due to the dreadedorg.scijava.ops.api.OpMatchingException: No Ops found matching this request.When I look forops.yamlin scijava-ops-image, I find nothing:@gselzer Any hints on why the new Op is getting discovered for the unit tests, but not in my IDE?
gselzer commentedon May 27, 2026
@ctrueden I'm not sure in your case, but it might have to do with IntelliJ doing the builds. I do know that IntelliJ's
Build -> Build Projectis (currently) incapable of generatingops.yamlfiles. Here's what I tried:git checkout scijava-ops-image/image-equation.mvn clean install. Build completes with passing tests.EquationTestfails in IntelliJ.CreateImgTest(arbitrarily chosen) fails in IntelliJgit checkout main.mvn clean install. Build completes with passing tests.CreateImgTestpasses in IntelliJ.git checkout scijava-ops-image/image-equation^.mvn clean install. Build completes with passing tests.EquationTestpasses in IntelliJ.CreateImgTestpasses in IntelliJ.git checkout scijava-ops-image/image-equation.mvn clean install. Build completes with passing tests.EquationTestpasses in IntelliJ.CreateImgTestpasses in IntelliJBuild -> Build Project.EquationTestfails in IntelliJ.In the past, I always found a CLI build necessary when I wrote a new Op. So maybe see if IntelliJ is automatically building or something?