hi
how to convert the Y = typecast(uint32(X), 'uint32') to real no.
for example I want to calculate the present velocity for dynamixel servo motor. it is suppose to be -16
but each time I calculate it, I got this no. (4294967278)
MATLAB: How to convert uint32(4294967278) to -16
typecastuint32
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It really depends on how you performed your computations. Let's take a somewhat large number, 3^40.
xDouble = 3^40;xUint64 = uint64(3)^40;areTheseTheSame = [uint64(xDouble); xUint64]The answer to the implied question is no. The reason the two elements of areTheseTheSame are not the same is that 3^40 is greater than flintmax.
isGreaterThanFlintmax = xDouble > flintmax % true
The key statement in the flintmax documentation is "Above this value, double-precision format does not have integer precision, and not all integers can be represented exactly." The next largest representable number above flintmax is not flintmax+1 but flintmax+2.
>> F1 = flintmax;>> F2 = flintmax + 1;>> F1 == F2ans = logical 1>> eps(flintmax)ans = 2>> F3 = flintmax + 2;>> F1 == F3ans = logical 0However, 3^40 is less than the maximum value that you can store in a uint64 so it can be exactly represented in uint64.
isLessThanMaximumUint64 = xUint64 < intmax('uint64') % trueIf your computations are likely to result in large (greater than flintmax) integer values, you should probably operate on values stored in an integer data type as much as you can, like I did when I computed xUint64 by computing mpower (the ^ operator) on a uint64 value.
This issue has been corrected in MATLAB 6.5.1 (R13SP1). MATLAB 6.5.1 (R13SP1) is now supported on Solaris 9. If you are using a previous version, see the following workaround:
To change the limit of your file descriptors, add the following line in the SOL2 section of the $MATLABROOT/etc/lmopts.sh script.
ulimit -n 1024This line can be added anywhere in the SOL2 section as long as it is not in the IF Statement. Note that $MATLABROOT refers to the MATLAB root directory.
If this does not solve the problem, you can also try putting the above ulimit statement in /etc/init.d/lmgrd right before calling lmboot instead of in lmopts.sh.
For Example:
In lmopts.sh file Sol2 section, add the ulimit -n 1024 line following the line beginning with LM_BOOT_FRAGMENT.
#**************************************************************************** # Platform specific section: #**************************************************************************** # case "$ARCH" in sol2) #---------------------------------------------------------------------------- # LM_ROOT and AUTOMOUNT_MAP originally set by install_matlab # LM_ROOT=/home/whsiao/Madmax/R13_Indiv/etc AUTOMOUNT_MAP= ARCH="$ARCH" LM_BOOT_FRAGMENT=/etc/init.d/lmgrd ulimit -n 1024 #
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