replaceWithApproximate
Class: FunctionApproximation.LUTSolution
Namespace: FunctionApproximation
Replace block with the generated lookup table approximation
Syntax
replaceWithApproximate(solution)
Description
replaceWithApproximate( replaces the
simulink block with its lookup table approximation, generated using the solution)approximate
method of the FunctionApproximation.LUTSolution object.
Input Arguments
Examples
This example shows how to approximate a block using a lookup table approximation, replace the original block with the approximation, and then revert the block back to its original state.
Open the model containing the block to approximate. In this example, replace the tan block with a lookup table approximation.
open_system('ex_luto_approx')
Create a FunctionApproximation.Problem object specifying what you want to approximate.
problem = FunctionApproximation.Problem('ex_luto_approx/Trigonometric Function')
problem =
1×1 FunctionApproximation.Problem with properties:
FunctionToApproximate: 'ex_luto_approx/Trigonometric Function'
NumberOfInputs: 1
InputTypes: "numerictype('double')"
InputLowerBounds: -1.5083
InputUpperBounds: 1.5083
OutputType: "numerictype('double')"
Options: [1×1 FunctionApproximation.Options]
Use default values for all other options. To approximate the block use the solve method.
solution = solve(problem)
Searching for fixed-point solutions.
| ID | Memory (bits) | Feasible | Table Size | Breakpoints WLs | TableData WL | BreakpointSpecification | Error(Max,Current) |
| 0 | 48 | 0 | 2 | 8 | 16 | EvenSpacing | 7.812500e-03, 9.471100e+00 |
| 1 | 800 | 0 | 49 | 8 | 16 | EvenSpacing | 7.812500e-03, 4.497029e-01 |
| 2 | 1584 | 1 | 98 | 8 | 16 | EvenSpacing | 7.812500e-03, 1.016505e-05 |
| 3 | 1056 | 0 | 65 | 8 | 16 | EvenSpacing | 7.812500e-03, 4.497029e-01 |
| 4 | 544 | 0 | 33 | 8 | 16 | EvenSpacing | 7.812500e-03, 4.497029e-01 |
| 5 | 416 | 0 | 25 | 8 | 16 | EvenSpacing | 7.812500e-03, 4.497029e-01 |
| 6 | 368 | 0 | 22 | 8 | 16 | EvenSpacing | 7.812500e-03, 4.534664e+00 |
| 7 | 64 | 0 | 2 | 16 | 16 | EvenSpacing | 7.812500e-03, 9.517788e+00 |
| 8 | 768 | 1 | 46 | 16 | 16 | EvenSpacing | 7.812500e-03, 2.192364e-04 |
| 9 | 752 | 1 | 45 | 16 | 16 | EvenSpacing | 7.812500e-03, 1.220687e-04 |
| 10 | 592 | 1 | 35 | 16 | 16 | EvenSpacing | 7.812500e-03, 2.388241e-04 |
| 11 | 576 | 1 | 34 | 16 | 16 | EvenSpacing | 7.812500e-03, 6.201875e-05 |
| 12 | 416 | 0 | 24 | 16 | 16 | EvenSpacing | 7.812500e-03, 8.559014e-01 |
| 13 | 400 | 0 | 23 | 16 | 16 | EvenSpacing | 7.812500e-03, 1.008229e+00 |
| 14 | 496 | 0 | 29 | 16 | 16 | EvenSpacing | 7.812500e-03, 2.136958e-01 |
| 15 | 528 | 1 | 31 | 16 | 16 | EvenSpacing | 7.812500e-03, 1.018354e-04 |
| 16 | 512 | 0 | 30 | 16 | 16 | EvenSpacing | 7.812500e-03, 1.037605e-01 |
| 17 | 288 | 0 | 16 | 16 | 16 | EvenSpacing | 7.812500e-03, 2.391904e+00 |
| 18 | 464 | 0 | 27 | 16 | 16 | EvenSpacing | 7.812500e-03, 4.491186e-01 |
| 19 | 80 | 0 | 2 | 8 | 32 | EvenSpacing | 7.812500e-03, 9.471052e+00 |
| 20 | 48 | 0 | 2 | 8 | 16 | EvenPow2Spacing | 7.812500e-03, 1.146582e+01 |
| 21 | 416 | 0 | 25 | 8 | 16 | EvenPow2Spacing | 7.812500e-03, 4.497029e-01 |
| 22 | 224 | 0 | 13 | 8 | 16 | EvenPow2Spacing | 7.812500e-03, 2.887487e+00 |
| 23 | 64 | 0 | 2 | 16 | 16 | EvenPow2Spacing | 7.812500e-03, 1.145654e+01 |
| 24 | 432 | 0 | 25 | 16 | 16 | EvenPow2Spacing | 7.812500e-03, 6.957588e-01 |
| 25 | 240 | 0 | 13 | 16 | 16 | EvenPow2Spacing | 7.812500e-03, 3.221296e+00 |
| 26 | 80 | 0 | 2 | 8 | 32 | EvenPow2Spacing | 7.812500e-03, 1.146600e+01 |
| 27 | 432 | 0 | 13 | 8 | 32 | EvenPow2Spacing | 7.812500e-03, 2.887556e+00 |
| 28 | 96 | 0 | 2 | 16 | 32 | EvenPow2Spacing | 7.812500e-03, 1.145661e+01 |
| 29 | 448 | 0 | 13 | 16 | 32 | EvenPow2Spacing | 7.812500e-03, 3.221186e+00 |
| 30 | 128 | 0 | 2 | 32 | 32 | EvenPow2Spacing | 7.812500e-03, 1.145660e+01 |
| 31 | 480 | 0 | 13 | 32 | 32 | EvenPow2Spacing | 7.812500e-03, 3.220685e+00 |
| 32 | 96 | 0 | 2 | 32 | 16 | EvenPow2Spacing | 7.812500e-03, 1.145654e+01 |
| 33 | 464 | 0 | 25 | 32 | 16 | EvenPow2Spacing | 7.812500e-03, 6.951333e-01 |
| 34 | 272 | 0 | 13 | 32 | 16 | EvenPow2Spacing | 7.812500e-03, 3.220611e+00 |
| 35 | 216 | 1 | 9 | 8 | 16 | ExplicitValues | 7.812500e-03, 9.900552e-04 |
| 36 | 192 | 0 | 8 | 8 | 16 | ExplicitValues | 7.812500e-03, 1.142949e-02 |
| 37 | 192 | 0 | 8 | 8 | 16 | ExplicitValues | 7.812500e-03, 1.142949e-02 |
| 38 | 192 | 0 | 8 | 8 | 16 | ExplicitValues | 7.812500e-03, 1.142949e-02 |
| 39 | 192 | 0 | 8 | 8 | 16 | ExplicitValues | 7.812500e-03, 1.142949e-02 |
| 40 | 192 | 1 | 8 | 8 | 16 | ExplicitValues | 7.812500e-03, 1.383244e-03 |
Searching for floating-point solutions.
| 41 | 64 | 0 | 2 | 16 | 16 | EvenSpacing | 7.812500e-03, 9.424033e+00 |
| 42 | 768 | 0 | 46 | 16 | 16 | EvenSpacing | 7.812500e-03, 9.531209e-01 |
| 43 | 752 | 1 | 45 | 16 | 16 | EvenSpacing | 7.812500e-03, 3.864191e-05 |
| 44 | 160 | 0 | 2 | 16 | 64 | EvenSpacing | 7.812500e-03, 9.421379e+00 |
| 45 | 64 | 0 | 2 | 16 | 16 | EvenPow2Spacing | 7.812500e-03, 1.145605e+01 |
| 46 | 160 | 0 | 2 | 16 | 64 | EvenPow2Spacing | 7.812500e-03, 1.145598e+01 |
Best Solution
| ID | Memory (bits) | Feasible | Table Size | Breakpoints WLs | TableData WL | BreakpointSpecification | Error(Max,Current) |
| 40 | 192 | 1 | 8 | 8 | 16 | ExplicitValues | 7.812500e-03, 1.383244e-03 |
solution =
1×1 FunctionApproximation.LUTSolution with properties:
ID: 40
Feasible: "true"
Generate a Simulink® subsystem containing the lookup table approximation using the approximate method.
approximate(solution)
Replace the original block with the approximation.
replaceWithApproximate(solution)
You can revert the system back to its original state using the revertToOriginal method.
revertToOriginal(solution)
Version History
Introduced in R2018b
