replaceWithApproximate

Class: FunctionApproximation.LUTSolution
Namespace: FunctionApproximation

Replace block with the generated lookup table approximation

Syntax

replaceWithApproximate(solution)

Description

replaceWithApproximate(solution) replaces the simulink block with its lookup table approximation, generated using the approximate method of the FunctionApproximation.LUTSolution object.

Input Arguments

expand all

`solution` — Solution to use to replace the source block
`FunctionApproximation.LUTSolution` object

Solution to replace the source block, specified as a FunctionApproximation.LUTSolution object.

Examples

expand all

Replace a Block with an Approximation

Open Script

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 = 

  1x1 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: [1x1 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 = 

  1x1 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

replaceWithApproximate

Syntax

Description

Input Arguments

`solution` — Solution to use to replace the source block
`FunctionApproximation.LUTSolution` object

Examples

Replace a Block with an Approximation

Version History

See Also

Topics

replaceWithApproximate

Syntax

Description

Input Arguments

solution — Solution to use to replace the source block FunctionApproximation.LUTSolution object

Examples

Replace a Block with an Approximation

Version History

See Also

Topics

`solution` — Solution to use to replace the source block
`FunctionApproximation.LUTSolution` object