fixed point .bin not showing any bits
in [Matlab]
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From: Alex on 24 Mar 2010 10:55 When I try to get the binary representation of a fixed point variable, it returns nothing, but when I assign it to a temp variable and check the bin of that, it is the correct value. I am not sure why the .bin is not reporting correctly... Any advice? Thanks! Here are my settings for the fimath: fiSettings = fimath('castbeforesum', false, 'OverflowMode', 'saturate','ProductMode', 'KeepMSB', 'SumMode', 'KeepMSB', 'ProductWordLength',32,'SumWordLength',32); Below is a contextual example: >> fipsufluxx(cnt) ans = -1422 DataTypeMode: Fixed-point: binary point scaling Signedness: Signed WordLength: 16 FractionLength: 0 >> fipsufluxx.bin(cnt) ans = >> x=fipsufluxx(cnt) x = -1422 DataTypeMode: Fixed-point: binary point scaling Signedness: Signed WordLength: 16 FractionLength: 0 >> x.bin ans = 1111101001110010
From: Ashok Charry on 24 Mar 2010 11:24 Alex, When you call the bin on a fi that is a vector thats going to give you one long string (single string) of 1's & 0's with empty spaces in-between to separate one value from the next: a = fi(rand(1,5)); a.bin ans = 0011001110110011 0000110001011001 0001000011100101 0111100010010101 0111101001100011 Then depending on what your index "cnt" is you might just end up getting an ' ' (space) because with the syntax a.bin(cnt) you are really indexing into the binary string and not into a: a.bin(17) ans = % this is an empty space because the the wordlength is 16 so the 17 % "bin" value is a space to separate the 1st value from the second. To do what you want to do and in one step this is what you need to type: % say I want the bin of the 4th value in a: bin(a(4)) ans = 0111100010010101 Hope this answers your questions and helps you out. Thanks! Ashok Charry The Mathworks On 3/24/10 10:55 AM, Alex wrote: > When I try to get the binary representation of a fixed point variable, > it returns nothing, but when I assign it to a temp variable and check > the bin of that, it is the correct value. I am not sure why the .bin is > not reporting correctly... Any advice? > > Thanks! > > Here are my settings for the fimath: > fiSettings = fimath('castbeforesum', false, 'OverflowMode', > 'saturate','ProductMode', 'KeepMSB', 'SumMode', 'KeepMSB', > 'ProductWordLength',32,'SumWordLength',32); > > Below is a contextual example: > >>> fipsufluxx(cnt) > > ans = > > -1422 > > DataTypeMode: Fixed-point: binary point scaling > Signedness: Signed > WordLength: 16 > FractionLength: 0 >>> fipsufluxx.bin(cnt) > > ans = > > > >>> x=fipsufluxx(cnt) > > x = > > -1422 > > DataTypeMode: Fixed-point: binary point scaling > Signedness: Signed > WordLength: 16 > FractionLength: 0 >>> x.bin > > ans = > > 1111101001110010
From: Alex on 24 Mar 2010 11:34 Ashok, you have saved me again! I guess that sort of makes sense that .bin is a string... I just wasnt expecting it since int and double work the way I implemented. Thanks! Ashok Charry <acharry(a)mathworks.com> wrote in message <hodarb$fsp$3(a)fred.mathworks.com>... > Alex, > > When you call the bin on a fi that is a vector thats going to give you > one long string (single string) of 1's & 0's with empty spaces > in-between to separate one value from the next: > > a = fi(rand(1,5)); > a.bin > > ans = > > 0011001110110011 0000110001011001 0001000011100101 > 0111100010010101 0111101001100011 > > Then depending on what your index "cnt" is you might just end up > getting an ' ' (space) because with the syntax a.bin(cnt) you are really > indexing into the binary string and not into a: > > a.bin(17) > > ans = > > % this is an empty space because the the wordlength is 16 so the 17 > % "bin" value is a space to separate the 1st value from the second. > > To do what you want to do and in one step this is what you need to type: > % say I want the bin of the 4th value in a: > > bin(a(4)) > ans = > > 0111100010010101 > > Hope this answers your questions and helps you out. > > > Thanks! > > Ashok Charry > The Mathworks > > > On 3/24/10 10:55 AM, Alex wrote: > > When I try to get the binary representation of a fixed point variable, > > it returns nothing, but when I assign it to a temp variable and check > > the bin of that, it is the correct value. I am not sure why the .bin is > > not reporting correctly... Any advice? > > > > Thanks! > > > > Here are my settings for the fimath: > > fiSettings = fimath('castbeforesum', false, 'OverflowMode', > > 'saturate','ProductMode', 'KeepMSB', 'SumMode', 'KeepMSB', > > 'ProductWordLength',32,'SumWordLength',32); > > > > Below is a contextual example: > > > >>> fipsufluxx(cnt) > > > > ans = > > > > -1422 > > > > DataTypeMode: Fixed-point: binary point scaling > > Signedness: Signed > > WordLength: 16 > > FractionLength: 0 > >>> fipsufluxx.bin(cnt) > > > > ans = > > > > > > > >>> x=fipsufluxx(cnt) > > > > x = > > > > -1422 > > > > DataTypeMode: Fixed-point: binary point scaling > > Signedness: Signed > > WordLength: 16 > > FractionLength: 0 > >>> x.bin > > > > ans = > > > > 1111101001110010
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