Download LDAK

Thanks for your details, I will only use these to inform you of a major update to LDAK (which happens less than once a year). To avoid having to enter your details again on the previous page, you can click the link below the sign-up box.

LDAK is a command-line software, that can be run on either Linux or a Mac. I strongly recommend the Linux version, as it will often be much faster than the Mac version. LDAK does not run on Windows, so I suggest you instead log into a Linux server (for example, you can use putty to ssh into your local computer cluster).

There are three ways to obtain LDAK; you can download the LDAK executable, you can install LDAK via conda, or you can compile your own version of LDAK from the source code.
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Use the LDAK executable on Linux computers:
(note that if using a MAC, you should instead follow the instructions just below)

1 - Download and unzip the Linux executable file (link at the bottom)

2 - Open a terminal window (on my Linux, I go to Applications / System Tools / Terminal)

3 - Type the name of the file; for example
/home/doug/Downloads/ldak6.linux
or if you are in the same folder as the executable file, you can simply type
./ldak6.linux

If compatible with your system, this should produce the LDAK welcome screen. Note that if your computer tells you that you do not have permission to run the file, then first run
chmod a+x ldak6.linux
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Use the LDAK executable on a MAC:
(note that if using Linux, you should instead follow the instructions just above)

1 - Download and unzip the Mac executable file (link at the bottom)

2 - Open a terminal window (go to Finder / Applications / Utilities)

3 - Type the name of the file; for example
Downloads/ldak5.2.mac
or if you are in the same folder as the executable file, you can simply type
./ldak5.2.mac

If compatible with your system, this should produce the LDAK welcome screen. Note that if your computer tells you that you do not have permission to run the file, then first run
chmod a+x ldak5.2.mac
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Install LDAK via conda:

Details to come
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Compile a Linux version of LDAK from the source code:
(note that if using a MAC, you should instead follow the instructions just below)

The pre-compiled Linux version uses the Intel MKL Libraries. The command I used was

gcc --static -O3 -o ldak6.linux ldak/ldak.c ldak/libqsopt.linux.a -m64 -Wl,--start-group ${MKLROOT}/lib/libmkl_intel_lp64.a ${MKLROOT}/lib/libmkl_gnu_thread.a ${MKLROOT}/lib/libmkl_core.a -Wl,--end-group -lgomp -lpthread -lm -ldl -lz -I${MKLROOT}/include -fopenmp -L/home/doug/opt/lib -I/home/doug/opt/include

Should you wish to compile a Linux version yourself, please download and unzip the source code (link at the bottom), then from inside that folder run a command similar to

gcc -O3 -o ldak6 ldak.c libqsopt.linux.a -lblas -llapack -lm -lz -fopenmp
chmod a+x ldak6

The exact command will depend on which libraries you have installed. This should take less than a minute to complete. Note that if you do not have Intel MKL Libraries installed, you will be required to turn off the MKL libraries, by editing Line 63 of ldak.c (replace #define MKL 1 with #define MKL 0). If you are required to do this, then your self-compiled version will likely be slower than the pre-compiled version.
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Compile a MAC version of LDAK from the source code:
(note that if using Linux, you should instead follow the instructions just above)

To compile a Mac version yourself, please download and unzip the source code (link at the bottom), then from inside that folder run a command similar to

gcc -O3 -o ldak5.2.mac ldak.c libqsopt.mac.a -lblas -llapack -lm -lz
chmod a+x ldak5.2.mac

The exact command will depend on your system and which libraries you have installed. This should take about a minute to complete. Note that you will be required to turn off the MKL libraries, by editing Line 63 of ldak.c (replace #define MKL 1 with #define MKL 0). Further, it may be necessary to add --framework accelerate to the above command, and/or to install xcode, by first running the command

xcode-select --install
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Latest LDAK Executables:

Below are links to the Linux and Mac versions of the LDAK executable. Note that each link will take you to a GitHub page; you should then click the download button in the right corner.

Click here to download ldak6.linux
Click here to download ldak5.2.mac

Beta Linux Executable:

Below is a link to a later Linux version of LDAK, but please only use this version if asked.

Click here to download LDAK6.beta

LDAK Source Code:

You can download the source code by visiting the LDAK GitHub pages, then clicking on the green button that says "Code" and selecting the option "Download zip".

Click here to visit the LDAK GitHub Pages.