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Calling Sequence
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Feedback(steps,options)
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Parameters
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steps
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solution steps {canvas-string,table,rtable,list}
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options
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(optional) equation(s) of the form option = value
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Options
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given = list of step expressions prepending the solution
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group = integer or set of integers, restrict the elements to inspect to the specified group(s)
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filter = set(equation), input element filters passed to GetMath
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output = default, list or canvaslist, specify an output format
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cursorgroup = truefalse, when true consider only elements in the group containing the cursor (Maple Learn only)
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stepcheck = procedure, procedure for custom analysis
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stepdata = anything, user-defined data passed to stepcheck
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Description
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The Feedback command analyzes a step-by-step progression of an expression into different forms and reports feedback for each step of the solution. It is a general front-end interface that dispatches to one of the other "Feedback" commands to report on solving, integration, differentiation, simplification, factoring, etc.
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The given argument is a list of expressions that will be prepended to the steps input. When part of an interactive canvas-based application this parameter can used behind the scenes to ensure the correct expression is listed first.
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The step analysis can be customized for a particular problem type by providing a stepcheck procedure. The stepcheck procedure takes arguments: proc( allsteps:list, expr, inert_expr, data ). It will be called once per expression in the given set of steps, passing in the full list of steps, the individual current steps[i], the inert-form of steps[i] (if available), and the provided stepdata.
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For example, the FactorSteps command is built on top of SimplifyFeedback, by providing a stepcheck procedure that can identify special steps like synthetic division, and provide feedback about the end goal of arriving at a fully factored form.
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When the optional argument, group=1, or group={2,3} is specified in conjunction with a canvas-based solution input, only the specified elements in the given group or groups will be considered when generating feedback.
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The output option can be set to default, list, or canvaslist. When solution is a canvas, the default action is to generate a Script, which will be applied to the active Canvas. Otherwise, when solution is an Array or list, the default output is a list of strings.
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Use output = list to force list-of-strings output even when solution is a canvas.
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Use output = canvaslist to return a list of [string,record] pairs, when solution is a canvas. This returns a list of lists, where the [i,1] element is a feedback comment string, and the [i,2] element is the canvas record-object that identifies the expression for which the feedback applies. The record-object can be inspected as per any object returned by GetMath, or it can be passed as an argument to some Script commands like Annotate.
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The filter option applies to canvas-based input, and will cause the canvas elements to be pruned if they match the given specified properties. For example, 'filter'={'readonly'=true} will prune out all math containers that have their readonly property set to true.
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Examples
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>
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Compatibility
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The Grading:-Feedback command was introduced in Maple 2024.
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