10
Dec
Posted in Blog Personal by carlosap |
Error: The installer was unable to check for a valid password file. Your Mathematica installation may be incomplete or corrupted
25 11 2007
Many people face this error when they try to install Mathematics on Linux :
Error: The installer was unable to check for a valid password file. Your
Mathematica installation may be incomplete or corrupted.
it is because some libraries are missing , just download these :
sudo apt-get install build-essential
sudo apt-get install libstdc++5
Centos
sudo yum install yum install compat-libstdc++*
Font Server:
http://linuxreviews.org/howtos/xfree/xfs/
http://support.wolfram.com/mathematica/systems/unix/general/fonterrors.html
10
Dec
Posted in Blog Personal by carlosap |
* Method 1: Use CDEmu.
cdemu 0 pro.cue
mount -t iso9660 /dev/cdemu/0 /mnt/temp
* Method 2: Convert to ISO.
Convert BIN/CUE to ISO:
bchunk -v acrobat6pro.bin pro.cue pro
File Attachment: bchunk-1.2.0.tar.gz (14 KB)
* Just mount the ISO by executing as root.
mount -o loop,ro -t iso9660 <filename>.iso <mountpoint>
mount -o loop pro01.iso /mnt/temp
8
Dec
Posted in elearn by carlosap |
By Antonio Cangiano. Filed under Essential Math, Software
About 50,000 people read my article 3 awesome free Math programs. Chances are that at least some of them downloaded and installed Maxima. If you are one of them but are not acquainted with CAS (Computer Algebra System) software, Maxima may appear very complicated and difficult to use, even for the resolution of simple high school or calculus problems. This doesn’t have to be the case though, Maxima is very friendly and this 10 minute tutorial will get you started right away. Once you’ve got the first steps down, you can always look up the specific function that you need, or learn more from Maxima’s official manual. Alternatively, you can use the question mark followed by a string to obtain in-line documentation (e.g. ? integrate). This tutorial takes a practical approach, where simple examples are given to show you how to compute common tasks. Of course this is just the tip of the iceberg. Maxima is so much more than this, but scratching even just the surface should be enough to get you going. In the end you are only investing 10 minutes.
Read more… »
8
Dec
Posted in Linux by carlosap |
Task: How to halt/stop user called didi
Type the skill command as follows:
# skill -STOP -u didi
You muse be root to stop other users.
Task: How to resume already halted user called didi
Send CONT single to user didi, type the following command:
# skill -CONT -u didi
Task: How to kill and logout user called didi
You can send KILL single, type the following command:
# skill -KILL -u didi
Task: Kill and logout all users
The ultimate command to kill and logout all users, type the following command:
# skill -KILL -v /dev/pts/*
Please note that send users warning message or logout notice using wall command to avoid data loss.
8
Dec
Posted in elearn by carlosap |
Sage
float(integral(x*cos(2*x),x,0,1))
0.10061200427605527
show(integral(x*cos(2*x),x,0,1))
show(expand((x-3/8)^10))
G = graphs.CubeGraph(5); G
show(plot3d(G, xres=1280, yres=1024))
Mathematica
NIntegrate[x Cos[2 x], {x, 0, 1}]
0.100612
