Display "fixdt" data type in Simulink format

Hi!

Is there is way to convert a data type information from 'fixdt(1,16,0)' format to the compiled Simulink data type format?

'fixdt(1,16,0)' --> 'int16'

fixdt(0,16,-5)' --> 'ufix16_E5'

'fixdt(1,5,12)' --> 'sfix5_En12'

I would like to get a simulink.parameter variable data type in this form.

Thanks!

Answer 1

[Abhijeet]

Hi,

You can convert the data type information from 'fixdt(1,16,0)' format to the compiled Simulink data type format using the following rules:

1. If the first argument of the fixdt() function is 0, the Simulink data type format will start with 'u', which means unsigned. If the first argument is 1, the Simulink data type format will start with 's', which means signed.
2. The second argument of the fixdt() function specifies the number of bits in the data type. This can be directly translated to the Simulink data type format as 'intN' or 'uintN', depending on the sign of the data type.
3. The third argument of the fixdt() function specifies the position of the binary point. If this value is positive, it means the binary point is to the right of the least significant bit, and the Simulink data type format should be suffixed with '_En', where N is the absolute value of the third argument. If the value is negative, it means the binary point is to the left of the most significant bit, and the Simulink data type format should be suffixed with '_E', followed by the absolute value of the third argument.

For more information you can refer to the documentation - Fixdt

Hope this resolves your query.

[aida_p]

I was hoping there is a built-in function that does this conversion, but knowing there isnt one, I will just write my own. :) Thanks for the reply.

Answer 2

[Alexander Carmeli]

The tostringInternalSlName() method does exactly that:

fixdt(1, 16, 0).tostringInternalSlName

ans = 'int16'

fixdt(0, 16, -5).tostringInternalSlName

ans = 'ufix16_E5'

fixdt(1, 5, 12).tostringInternalSlName

ans = 'sfix5_En12'

You can find it on embedded.numerictype, and it works on Simulink.NumericType (what fixdt() produces) too.

methods(embedded.numerictype)

Methods for class embedded.numerictype:

SetBestFractionLength         getChildren                   getParent                     isHierarchyReadonly           isboolean                     propertyHyperlink             
SetBestPrecisionForMxArray    getCommonProperties           getPossibleProperties         isHierarchySimulating         isdouble                      qpointstr                     
abs                           getContext                    getPreferredProperties        isLibrary                     isequivalent                  range                         
acceptDrop                    getContextMenu                getPropAllowedValues          isLinked                      isfixed                       rmiGetString                  
areChildrenOrdered            getCurrentDialogPrompts       getPropDataType               isMasked                      isfloat                       rmiIsSupported                
areDescendentsReadonly        getDialogProxy                getPropValue                  isMatrix                      ishalf                        rmiSetString                  
canAcceptDrop                 getDialogSchema               getPropertyActions            isModelReference              isnumerictype                 set                           
canAcceptMouseDrop            getDialogSource               getSpecifiedSign              isNumeric                     ispropequal                   setPropValue                  
castLike                      getDisplayClass               getWidth                      isObserverReference           isscaleddouble                showChildrenInListView        
closeEditor                   getDisplayIcon                hasPropertyActions            isOpaque                      isscaledtype                  sqrt                          
ctranspose                    getDisplayLabel               indicesToUnload               isPointer                     isscalingbinarypoint          supportsIncrementalLoading    
delete                        getDisplayToRealProperty      isClass                       isReadonlyProperty            isscalingslopebias            tostring                      
disp                          getDropOperations             isComplex                     isScalar                      isscalingunspecified          tostringInternalFixdt         
divide                        getForwardedObject            isDragAllowed                 isSimd                        issingle                      tostringInternalSlName        
doDropOperation               getFullName                   isDropAllowed                 isStructure                   isslopebiasscaled             transpose                     
eps                           getHierarchicalChildren       isEditableProperty            isTunableProperty             isslopebiasscalingset         upperbound                    
evalDialogParams              getInfoForIncrementalLoading  isEnum                        isValidProperty               lowerbound                    view                          
exploreAction                 getInstanceProperties         isHiddenObject                isVoid                        lsb                           
getActionIcon                 getMimeData                   isHierarchical                isanyfloat                    openEditor                    
getCheckableProperty          getMimeType                   isHierarchyBuilding           isbinarypointscalingset       openvar