Datatype not supported by stateflow data: Data overflow

In Stateflow flow graph. I have mentioned a statement

Difference = data1 - data2;

I have assumed data types for this variable as follows

Difference - int32 - local

data1 - int32 - local

data2 -int32 - local

During run time data1 takes 86458 and data2 takes 5381838. while debugging it shows me a error: data overflow...

Kindly Please anyone help me out in solving this issue

Thanks in advance...:)

[Walter Roberson]

"I have assumed data types" -- but has Stateflow assumed the same data types? The error you are seeing could happen if Stateflow was using unsigned data types such as uint32.

Answer 1

[Fangjun Jiang]

>> data1=int32(86458 )
data1 =
       86458
>> data2=int32(5381838)
data2 =
     5381838
>> Difference = data1 - data2
Difference =
    -5295380

It seems no problem in Matlab. Are you sure the error is caused by this? Could you step through Stateflow to see when the error occured?

[ramesh kumar sri]

Thanks for your answer....The problem is with stateflow, in comment promt it works well

[ramesh kumar sri]

debug>> TotalGDCSec

TotalGDCSec =

31294405

debug>> TotalTCUSec

TotalTCUSec =

62251371

debug>> TotalGDCSec-TotalTCUSec

ans =

0

debug>> TotalTCUSec-TotalGDCSec

ans =

30956966

[Walter Roberson]

That is exactly the behavior that one would see if the values were unsigned integers: unsigned integers "underflow" to 0 when you attempt to store a negative number in to them.

[Fangjun Jiang]

Walter might be right. Are you sure you declare those variables as int32, not as uint32?

>> data1=uint32(86458 )

data1 =

86458

>> data2=uint32(5381838)

data2 =

5381838

>> data2-data1

ans =

5295380

>> data1-data2

ans =

0

[ramesh kumar sri]

Thanks for your answer, The problem is solved. The problem is i have taken difference to be int32, but data1 and data2 to be uint32. But in this case we need all data to be same datatype..

[ramesh kumar sri]

Thanks a lot Fangjun Jiang & Walter Roberson