ismember is not supported for fixed-point conversion

I am coverting the floating point to fixed point using Matlab coder

Below is code

function isOut = Verify_ismember_data()
Y    = 51;
locs = 4;
isOut = ismember(1:Y,locs);  % I tried  isOut = all(ismember(Y,locs)) & intersect- this does not help
plot(isOut,'b-x','Linewidth',2);

ismember is not supported for fixed-point conversion.

[Guillaume]

I don't see where fixed point is used in your code snippet.

I don't have the fixed-point toolbox and I've never used fixed-point in matlab (but have in other contexts). If ismember doesn't support fixed-point numbers can't you just compare the underlying integer representation with ismember instead. This assumes that the fixed point numbers you want to compare have the same precision of course.

[Adam Danz]

The function doesn't have any inputs and I don't see any fixed point values. If the error is unexpected, make sure you're not shadowing the ismember function.

which ismember -all
% C:\Program Files\MATLAB\R2019b\toolbox\matlab\ops\ismember.m     Example output, 1st row

[Life is Wonderful]

Thanks a lot for all the inputs.

Adam Danz /Guillaume , this is coming out of audio topic.

I am using c code generation for the ismember matlab function. For this ,I use MATLAB Coder™ [ Use to generate C code from Matlab code].

We get Matlab code from the APPS ( Toolbar ribbon , HOME,PLOTS,APPS,EDITOR,PUBLISH,VIEW)

Irrespctive of fixed data or floating data vector, ismember for Fixed point converter throws error "ismember is not supported for fixed-point conversion"

The function doesn't have any inputs and I don't see any fixed point values

I can think of somethiing like below , You have pks as floating values and locs as fixed values

function isOut = Verify_ismember_data(pks,locs)
isOut = ismember(1:size(pks),locs);

The requirement was derived from below data(

        locs    |   pks    |
      ----------+----------+
         2	|   0.0102 | 
         3	|   0.0096 |
         4	|   0.0058 |
         5	|   0.0044 |
         9	|   0.0036 |
         12	|   0.006  |
         13	|   0.0088 |
         14	|   0.0044 |
         15	|   0.0045 |
         16	|   0.0068 |
         17	|   0.0078 |
         18	|   0.0033 |
         21	|   0.9989 | *Peaks & locs
         23	|   0.0036 |
         24	|   0.0077 |
         25	|   0.008  |
         31	|   0.0048 |
         32	|   0.006  |
         35	|   0.0061 |
         36	|   0.0037 |
         39	|   0.0059 |
         40	|   0.0124 |
         41	|   0.0123 |
isOut = ismember(1:size(Y),locs);  

K>> class(locs)

ans =

    'double'

K>> class(Y)

ans =

    'double'

isOut = ismember(1:size(Y,1), locs);

I don't have the fixed-point toolbox and I've never used fixed-point in matlab (but have in other contexts)

This is generic or you have some other ideas for converting the Matlab function into C ( floating to fixed point), I would like to know , please share it.

Please find the ismember
K>> pwd

ans =

    'C:\Users\Release_version\Audio\Sandbox'

K>> which ismember -all
C:\Program Files\MATLAB\R2019b\toolbox\matlab\ops\ismember.m
C:\Program Files\MATLAB\R2019b\toolbox\matlab\ops\@cell\ismember.m                           % Shadowed cell method
C:\Program Files\MATLAB\R2019b\toolbox\matlab\codetools\@mtree\ismember.m                    % Shadowed mtree method
C:\Program Files\MATLAB\R2019b\toolbox\matlab\timefun\@datetime\ismember.m                   % Shadowed datetime method
C:\Program Files\MATLAB\R2019b\toolbox\matlab\timefun\@duration\ismember.m                   % Shadowed duration method
ismember is a built-in method                                                                % Shadowed mtree.Type method
ismember is a built-in method                                                                % Shadowed connector.internal.LoggerLevel method
ismember is a built-in method                                                                % Shadowed connector.internal.PromiseState method
ismember is a built-in method                                                                % Shadowed matlab.graphics.controls.internal.ToolbarValidator method
ismember is a built-in method                                                                % Shadowed matlab.lang.OnOffSwitchState method
ismember is a built-in method                                                                % Shadowed matlab.graphics.shape.internal.util.PointDataTipStyle method
ismember is a built-in method                                                                % Shadowed matlab.graphics.shape.internal.util.PinnableStyle method
ismember is a built-in method                                                                % Shadowed codertarget.targethardware.BaseProductID method
ismember is a built-in method                                                                % Shadowed codergui.ReportServices method
ismember is a built-in method                                                                % Shadowed coder.internal.gui.Features method
ismember is a built-in method                                                                % Shadowed coder.make.enum.BuildArtifact method
ismember is a built-in method                                                                % Shadowed coder.make.enum.BuildOutput method
ismember is a built-in method                                                                % Shadowed coder.descriptor.AutosarExpressionMode method
ismember is a built-in method                                                                % Shadowed coder.descriptor.AutosarParameterAccessMode method
ismember is a built-in method                                                                % Shadowed coder.descriptor.CoderGroupImplementation method
ismember is a built-in method                                                                % Shadowed coder.descriptor.EndianessEnum method
ismember is a built-in method                                                                % Shadowed coder.descriptor.IOAccessModes method
ismember is a built-in method                                                                % Shadowed coder.descriptor.IntDivRoundToEnum method
ismember is a built-in method                                                                % Shadowed coder.descriptor.LUTObjectStructOrderExplicitValues method
ismember is a built-in method                                                                % Shadowed coder.descriptor.ModelSelfCategoryEnum method
ismember is a built-in method                                                                % Shadowed coder.descriptor.TaskingModes method
ismember is a built-in method                                                                % Shadowed coder.descriptor.TimingModes method
ismember is a built-in method                                                                % Shadowed coder.descriptor.types.DataStoreKind method
ismember is a built-in method                                                                % Shadowed coder.descriptor.types.IOTypes method
ismember is a built-in method                                                                % Shadowed coder.descriptor.mem.AutosarExpressionMode method
ismember is a built-in method                                                                % Shadowed coder.descriptor.mem.AutosarParameterAccessMode method
ismember is a built-in method                                                                % Shadowed coder.descriptor.mem.CoderGroupImplementation method
ismember is a built-in method                                                                % Shadowed coder.descriptor.mem.EndianessEnum method
ismember is a built-in method                                                                % Shadowed coder.descriptor.mem.IOAccessModes method
ismember is a built-in method                                                                % Shadowed coder.descriptor.mem.IntDivRoundToEnum method
ismember is a built-in method                                                                % Shadowed coder.descriptor.mem.LUTObjectStructOrderExplicitValues method
ismember is a built-in method                                                                % Shadowed coder.descriptor.mem.ModelSelfCategoryEnum method
ismember is a built-in method                                                                % Shadowed coder.descriptor.mem.TaskingModes method
ismember is a built-in method                                                                % Shadowed coder.descriptor.mem.TimingModes method
ismember is a built-in method                                                                % Shadowed coder.descriptor.mem.types.DataStoreKind method
ismember is a built-in method                                                                % Shadowed coder.descriptor.mem.types.IOTypes method
ismember is a built-in method                                                                % Shadowed coder.internal.BuildMode method
C:\Program Files\MATLAB\R2019b\toolbox\matlab\datatypes\@tabular\ismember.m                  % Shadowed tabular method
C:\Program Files\MATLAB\R2019b\toolbox\matlab\datatypes\categorical\@categorical\ismember.m  % Shadowed categorical method
C:\Program Files\MATLAB\R2019b\toolbox\matlab\bigdata\@tall\ismember.m                       % Shadowed tall method
C:\Program Files\MATLAB\R2019b\toolbox\mbc\mbc\@guidarray\ismember.m                         % Shadowed guidarray method
C:\Program Files\MATLAB\R2019b\toolbox\mbc\mbc\@xregpointer\ismember.m                       % Shadowed xregpointer method
C:\Program Files\MATLAB\R2019b\toolbox\mbc\mbcdata\@cgprojconnections\ismember.m             % Shadowed cgprojconnections method
C:\Program Files\MATLAB\R2019b\toolbox\parallel\gpu\@gpuArray\ismember.m                     % Shadowed gpuArray method
C:\Program Files\MATLAB\R2019b\toolbox\shared\statslib\@dataset\ismember.m                   % Shadowed dataset method
C:\Program Files\MATLAB\R2019b\toolbox\symbolic\symbolic\@sym\ismember.m                     % Shadowed sym method

Thank you!

[Guillaume]

"This is generic or you have some other ideas for converting the Matlab function into C "

If it's matlab automatically converting your double variables to fixed point I can't help you.

However, if it's your own code where you've defined the fixed-point format and variables yourself, then my suggestion is to temporarily convert the fixed-point values to their underlying integer type (a basic cast in C) and to call ismember on the integers.

[Life is Wonderful]

Thanks! Below is the ismember in c routine. Don't know why it's marked as spam

/* Include Files */
#include "ismember.h"
#include "sort.h"

/* Function Definitions */

/*
 * isOut = intersect(1:size(Y,1), locs);
 * Arguments    : const double Y[41]
 *                const boolean_T locs[41]
 *                boolean_T isOut[41]
 * Return Type  : void
 */
void ismember(const double Y[41], const boolean_T locs[41], boolean_T isOut
                  [41])
{
  int k;
  boolean_T y;
  boolean_T exitg1;
  int n;
  boolean_T x[41];
  int unusedExpr[41];
  int ilo;
  int imid;
  (void)Y;
  for (k = 0; k < 41; k++) {
    isOut[k] = false;
  }

  y = true;
  k = 0;
  exitg1 = false;
  while ((!exitg1) && (k < 40)) {
    y = (((int)locs[k] <= (int)locs[k + 1]) && y);
    if (!y) {
      exitg1 = true;
    } else {
      k++;
    }
  }

  if (!y) {
    for (k = 0; k < 41; k++) {
      x[k] = locs[k];
    }

    sort(x, unusedExpr);
    for (k = 0; k < 41; k++) {
      n = 0;
      ilo = 1;
      exitg1 = false;
      while ((!exitg1) && (41 >= ilo)) {
        imid = (ilo >> 1) + 19;
        if ((ilo & 1) == 1) {
          imid++;
        }

        if (k + 1 == x[imid]) {
          n = imid + 1;
          exitg1 = true;
        } else {
          ilo = imid + 2;
        }
      }

      if (n > 0) {
        while ((n - 1 > 0) && (k + 1 == x[n - 2])) {
          n--;
        }
      }

      if (n > 0) {
        isOut[k] = true;
      }
    }
  } else {
    for (k = 0; k < 41; k++) {
      n = 0;
      ilo = 1;
      exitg1 = false;
      while ((!exitg1) && (41 >= ilo)) {
        imid = (ilo >> 1) + 19;
        if ((ilo & 1) == 1) {
          imid++;
        }

        if (k + 1 == locs[imid]) {
          n = imid + 1;
          exitg1 = true;
        } else {
          ilo = imid + 2;
        }
      }

      if (n > 0) {
        while ((n - 1 > 0) && (k + 1 == locs[n - 2])) {
          n--;
        }
      }

      if (n > 0) {
        isOut[k] = true;
      }
    }
  }
}

[Adam Danz]

I'm afraid I don't have enough experience with Matlab Coder to be of much assistance here.

[Life is Wonderful]

No worries. Thanks a lot for your help.