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update to WHAM version 2.1.0

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This commit is contained in:
Axel Kohlmeyer
2025-03-16 17:25:55 -04:00
parent 035aefcc26
commit d65b0ce666
2 changed files with 62 additions and 310 deletions
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6
tools/lammps-gui/CMakeLists.txt
View File

@ -94,8 +94,8 @@ endif()
option(BUILD_WHAM "Download and compile WHAM executable from Grossfield Lab" YES) option(BUILD_WHAM "Download and compile WHAM executable from Grossfield Lab" YES)
if(BUILD_WHAM) if(BUILD_WHAM)
set(WHAM_URL "http://membrane.urmc.rochester.edu/sites/default/files/wham/wham-release-2.0.11.tgz" CACHE STRING "URL for WHAM tarball") set(WHAM_URL "http://membrane.urmc.rochester.edu/sites/default/files/wham/wham-release-2.1.0.tgz" CACHE STRING "URL for WHAM tarball")
set(WHAM_MD5 "f56751ac71a8d1c485b9ebd4ccff8dbe" CACHE STRING "MD5 checksum of WHAM tarball") set(WHAM_MD5 "4ed6e24254925ec124f44bb381c3b87f" CACHE STRING "MD5 checksum of WHAM tarball")
mark_as_advanced(WHAM_URL) mark_as_advanced(WHAM_URL)
mark_as_advanced(WHAM_MD5) mark_as_advanced(WHAM_MD5)
@ -122,7 +122,7 @@ if(BUILD_WHAM)
if(PATCH_FOUND) if(PATCH_FOUND)
message(STATUS "Apply patch to customize WHAM using ${Patch_EXECUTABLE}") message(STATUS "Apply patch to customize WHAM using ${Patch_EXECUTABLE}")
execute_process( execute_process(
COMMAND ${Patch_EXECUTABLE} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/update-wham-2.0.11.patch COMMAND ${Patch_EXECUTABLE} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/update-wham-2.1.0.patch
WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/_deps/src/wham/ WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/_deps/src/wham/
) )
endif() endif()

366
tools/lammps-gui/update-wham-2.0.11.patch → tools/lammps-gui/update-wham-2.1.0.patch
View File

@ -1,73 +1,29 @@
diff --git a/.gitignore b/.gitignore
index 28ac6ef..a401160 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,6 +6,8 @@ doc.toc
wham-dist.tar.gz
*.o
+*~
wham/wham
wham-2d/wham-2d
+/build
diff --git a/CMakeLists.txt b/CMakeLists.txt diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644 index b4f0fe6..a61cec8 100644
index 0000000..b4f0fe6 --- a/CMakeLists.txt
--- /dev/null
+++ b/CMakeLists.txt +++ b/CMakeLists.txt
@@ -0,0 +1,38 @@ @@ -1,7 +1,7 @@
+# Custom minimal -*- CMake -*- file for wham # Custom minimal -*- CMake -*- file for wham
+
+cmake_minimum_required(VERSION 3.16) cmake_minimum_required(VERSION 3.16)
+project(wham VERSION 2.0.11 -project(wham VERSION 2.0.11
+ DESCRIPTION "WHAM: a fast, memory efficient implementation of the Weighted Histogram Analysis Method" +project(wham VERSION 2.1.0
+ LANGUAGES C DESCRIPTION "WHAM: a fast, memory efficient implementation of the Weighted Histogram Analysis Method"
+ HOMEPAGE_URL http://membrane.urmc.rochester.edu/content/wham/) LANGUAGES C
+ HOMEPAGE_URL http://membrane.urmc.rochester.edu/content/wham/)
+include(GNUInstallDirs) diff --git a/doc/doc.tex b/doc/doc.tex
+ index cf36616..84ee891 100644
+add_executable(wham --- a/doc/doc.tex
+ nr/ran2.c +++ b/doc/doc.tex
+ nr/locate.c @@ -53,7 +53,7 @@ Suggestions and patches are welcome.
+ wham/wham.c
+ wham/file_read.c
+ wham/histogram.c \subsection{New in release 2.1.0}
+ wham/bootstrap.c -Two changes, both contributed by Alex Kohlmeyer. First, we switched from old
+) +Two changes, both contributed by Axel Kohlmeyer. First, we switched from old
+target_include_directories(wham PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/wham) make to CMake for the build. Second, we changed how energy units are set; where
+target_link_libraries(wham PRIVATE m) it used to be a compile-time option, now it is set on the command line.
+install(TARGETS wham DESTINATION ${CMAKE_INSTALL_BINDIR})
+
+add_executable(wham-2d
+ nr/ran2.c
+ nr/locate.c
+ wham-2d/wham-2d.c
+ wham-2d/file_read.c
+ wham-2d/histogram.c
+ wham/bootstrap.c
+)
+target_include_directories(wham-2d PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/wham)
+target_link_libraries(wham-2d PRIVATE m)
+install(TARGETS wham-2d DESTINATION ${CMAKE_INSTALL_BINDIR})
+
+install(FILES doc/doc.pdf
+ TYPE DOC
+ PERMISSIONS OWNER_READ GROUP_READ WORLD_READ
+)
diff --git a/nr/locate.c b/nr/locate.c
index 9f92dc0..f3bf294 100644
--- a/nr/locate.c
+++ b/nr/locate.c
@@ -11,7 +11,7 @@ void locate(double xx[], int n, double x, int *j)
ascnd=(xx[n] > xx[0]); // I think this makes it zero based
while (ju-jl > 1) {
jm=(ju+jl) >> 1;
- if (x > xx[jm] == ascnd)
+ if ((x > xx[jm]) == ascnd)
jl=jm;
else
ju=jm;
diff --git a/wham-2d/histogram.c b/wham-2d/histogram.c diff --git a/wham-2d/histogram.c b/wham-2d/histogram.c
index 1bd1329..b5d1c01 100644 index 1bd1329..b5d1c01 100644
--- a/wham-2d/histogram.c --- a/wham-2d/histogram.c
@ -127,99 +83,10 @@ index 1bd1329..b5d1c01 100644
- -
- -
diff --git a/wham-2d/wham-2d.c b/wham-2d/wham-2d.c diff --git a/wham-2d/wham-2d.c b/wham-2d/wham-2d.c
index fb6e059..a6b8483 100644 index 76389ac..05fe7cf 100644
--- a/wham-2d/wham-2d.c --- a/wham-2d/wham-2d.c
+++ b/wham-2d/wham-2d.c +++ b/wham-2d/wham-2d.c
@@ -25,7 +25,7 @@ @@ -417,8 +417,8 @@ while ( ! iConverged || first)
#include <time.h>
#include "wham-2d.h"
-#define COMMAND_LINE "Command line: wham-2d Px[=0|pi|val] hist_min_x hist_max_x num_bins_x Py[=0|pi|val] hist_min_y hist_max_y num_bins_y tol temperature numpad metadatafile freefile use_mask\n"
+#define COMMAND_LINE "Command line: wham-2d [units <real|metal|lj|...>] Px[=0|pi|val] hist_min_x hist_max_x num_bins_x Py[=0|pi|val] hist_min_y hist_max_y num_bins_y tol temperature numpad metadatafile freefile use_mask\n"
double HIST_MAXx,HIST_MINx,BIN_WIDTHx;
double HIST_MAXy,HIST_MINy,BIN_WIDTHy;
double TOL;
@@ -35,7 +35,7 @@ int NUM_BINSx, NUM_BINSy;
int PERIODICx, PERIODICy;
double PERIODx, PERIODy;
double *data1,**num,***bias;
-
+double k_B = k_B_DEFAULT;
int main(int argc, char *argv[])
{
@@ -57,7 +57,7 @@ double sum;
int iteration;
int max_iteration = 100000;
int numpad;
-int **mask;
+int **mask = NULL;
int use_mask;
cpu1 = ((double) clock())/CLOCKS_PER_SEC;
@@ -76,6 +76,61 @@ for (i=0; i<argc; i++)
}
printf("\n");
+// set k_B according to LAMMPS units settings
+if (strcmp(argv[1],"units") == 0)
+ {
+ if (argc < 3)
+ {
+ printf( COMMAND_LINE );
+ exit(-1);
+ }
+
+ if (strcmp(argv[2], "lj") == 0)
+ {
+ k_B = 1.0;
+ }
+ else if (strcmp(argv[2], "real") == 0)
+ {
+ k_B = 0.0019872067;
+ }
+ else if (strcmp(argv[2], "metal") == 0)
+ {
+ k_B = 8.617343e-5;
+ }
+ else if (strcmp(argv[2], "si") == 0)
+ {
+ k_B = 1.3806504e-23;
+ }
+ else if (strcmp(argv[2], "cgs") == 0)
+ {
+ k_B = 1.3806504e-16;
+ }
+ else if (strcmp(argv[2], "electron") == 0)
+ {
+ k_B = 3.16681534e-6;
+ }
+ else if (strcmp(argv[2], "micro") == 0)
+ {
+ k_B = 1.3806504e-8;
+ }
+ else if (strcmp(argv[2], "nano") == 0)
+ {
+ k_B = 0.013806504;
+ }
+ else if (strcmp(argv[2], "default") == 0)
+ {
+ k_B = k_B_DEFAULT;
+ }
+ else
+ {
+ printf("Unknown unit style: %s\n%s", argv[2], COMMAND_LINE);
+ exit(-1);
+ }
+ printf("# Setting value of k_B to = %.15g\n", k_B);
+ argc -= 2;
+ argv += 2;
+ }
+
PERIODICx = parse_periodic(argv[1], &PERIODx);
if (PERIODICx)
{
@@ -360,8 +415,8 @@ while ( ! iConverged || first)
for (j=0; j< NUM_BINSy; j++) for (j=0; j< NUM_BINSy; j++)
{ {
calc_coor(i,j,coor); calc_coor(i,j,coor);
@ -230,7 +97,7 @@ index fb6e059..a6b8483 100644
} }
} }
@@ -444,8 +499,9 @@ if (!FREEFILE) @@ -501,8 +501,9 @@ if (!FREEFILE)
for (j=0; j< NUM_BINSy; j++) for (j=0; j< NUM_BINSy; j++)
{ {
calc_coor(i,j,coor); calc_coor(i,j,coor);
@ -242,7 +109,7 @@ index fb6e059..a6b8483 100644
} }
} }
exit(errno); exit(errno);
@@ -461,25 +517,28 @@ else @@ -518,25 +519,28 @@ else
for (j=-numpad; j<0; j++) for (j=-numpad; j<0; j++)
{ {
calc_coor(i,j,coor); calc_coor(i,j,coor);
@ -280,7 +147,7 @@ index fb6e059..a6b8483 100644
} }
fprintf(FREEFILE, "\n"); fprintf(FREEFILE, "\n");
} }
@@ -490,25 +549,28 @@ else @@ -547,25 +551,28 @@ else
for (j=-numpad; j<0; j++) for (j=-numpad; j<0; j++)
{ {
calc_coor(i,j,coor); calc_coor(i,j,coor);
@ -318,7 +185,7 @@ index fb6e059..a6b8483 100644
} }
fprintf(FREEFILE, "\n"); fprintf(FREEFILE, "\n");
} }
@@ -519,25 +581,28 @@ else @@ -576,25 +583,28 @@ else
for (j=-numpad; j<0; j++) for (j=-numpad; j<0; j++)
{ {
calc_coor(NUM_BINSx+i,j,coor); calc_coor(NUM_BINSx+i,j,coor);
@ -356,30 +223,6 @@ index fb6e059..a6b8483 100644
} }
fprintf(FREEFILE, "\n"); fprintf(FREEFILE, "\n");
} }
diff --git a/wham-2d/wham-2d.h b/wham-2d/wham-2d.h
index b17e4bd..5fc17ff 100644
--- a/wham-2d/wham-2d.h
+++ b/wham-2d/wham-2d.h
@@ -20,15 +20,15 @@ extern int NUM_BINSy;
extern int PERIODICx,PERIODICy; // flags to turn on periodicity
extern double PERIODx, PERIODy; // flags to control periodic interval
+extern double k_B;
// A couple of predefined periodic units
#define DEGREES 360.0
#define RADIANS 6.28318530717959
-#define k_B 0.001982923700 // Boltzmann's constant in kcal/mol K
-//#define k_B 0.0083144621 // Boltzmann's constant kJ/mol-K
-//#define k_B 1.0 // Boltzmann's constant in reduced units
-
+#define k_B_DEFAULT 0.001982923700 // Boltzmann's constant in kcal/mol K
+//#define k_B_DEFAULT 0.0083144621 // Boltzmann's constant kJ/mol-K
+//#define k_B_DEFAULT 1.0 // Boltzmann's constant in reduced units
// Value inserted for the free energy of masked values
diff --git a/wham/histogram.c b/wham/histogram.c diff --git a/wham/histogram.c b/wham/histogram.c
index bc52d74..635b39f 100644 index bc52d74..635b39f 100644
--- a/wham/histogram.c --- a/wham/histogram.c
@ -432,7 +275,7 @@ index bc52d74..635b39f 100644
+return HIST_MIN + BIN_WIDTH*((double)i+0.5); +return HIST_MIN + BIN_WIDTH*((double)i+0.5);
} }
diff --git a/wham/wham.c b/wham/wham.c diff --git a/wham/wham.c b/wham/wham.c
index 487871b..edb8125 100644 index 19cf695..7bdbce1 100644
--- a/wham/wham.c --- a/wham/wham.c
+++ b/wham/wham.c +++ b/wham/wham.c
@@ -1,4 +1,4 @@ @@ -1,4 +1,4 @@
@ -441,25 +284,11 @@ index 487871b..edb8125 100644
* WHAM -- Weighted Histogram Analysis Method * WHAM -- Weighted Histogram Analysis Method
* *
* Reference 1: Computer Physics Communications, 91(1995) 275-282, Benoit Roux * Reference 1: Computer Physics Communications, 91(1995) 275-282, Benoit Roux
@@ -21,7 +21,7 @@ @@ -39,10 +39,9 @@ double kT; // temperature
#include "wham.h" int i,j;
int len;
int first;
-#define COMMAND_LINE "Command line: wham [P|Ppi|Pval] hist_min hist_max num_bins tol temperature numpad metadatafile freefile [num_MC_trials randSeed]\n" -int bin_min;
+#define COMMAND_LINE "Command line: wham [units <real|metal|lj|...>] [P|Ppi|Pval] hist_min hist_max num_bins tol temperature numpad metadatafile freefile [num_MC_trials randSeed]\n"
double HIST_MAX,HIST_MIN,BIN_WIDTH,TOL;
double *HISTOGRAM;
@@ -29,6 +29,7 @@ double kT;
int NUM_BINS;
int PERIODIC;
double PERIOD;
+double k_B = k_B_DEFAULT;
int main(int argc, char *argv[])
{
@@ -41,7 +42,7 @@ int first;
int bin_min;
int have_energy; int have_energy;
char *freefile; char *freefile;
-FILE *METAFILE, *FREEFILE; -FILE *METAFILE, *FREEFILE;
@ -467,69 +296,7 @@ index 487871b..edb8125 100644
struct hist_group *hist_group; struct hist_group *hist_group;
struct histogram *hp; struct histogram *hp;
double coor; double coor;
@@ -82,6 +83,61 @@ for (i=0; i<argc; i++) @@ -179,7 +178,7 @@ if (argc != 9 && argc !=11)
}
printf("\n");
+// set k_B according to LAMMPS units settings
+if (strcmp(argv[1],"units") == 0)
+ {
+ if (argc < 3)
+ {
+ printf( COMMAND_LINE );
+ exit(-1);
+ }
+
+ if (strcmp(argv[2], "lj") == 0)
+ {
+ k_B = 1.0;
+ }
+ else if (strcmp(argv[2], "real") == 0)
+ {
+ k_B = 0.0019872067;
+ }
+ else if (strcmp(argv[2], "metal") == 0)
+ {
+ k_B = 8.617343e-5;
+ }
+ else if (strcmp(argv[2], "si") == 0)
+ {
+ k_B = 1.3806504e-23;
+ }
+ else if (strcmp(argv[2], "cgs") == 0)
+ {
+ k_B = 1.3806504e-16;
+ }
+ else if (strcmp(argv[2], "electron") == 0)
+ {
+ k_B = 3.16681534e-6;
+ }
+ else if (strcmp(argv[2], "micro") == 0)
+ {
+ k_B = 1.3806504e-8;
+ }
+ else if (strcmp(argv[2], "nano") == 0)
+ {
+ k_B = 0.013806504;
+ }
+ else if (strcmp(argv[2], "default") == 0)
+ {
+ k_B = k_B_DEFAULT;
+ }
+ else
+ {
+ printf("Unknown unit style: %s\n%s", argv[2], COMMAND_LINE);
+ exit(-1);
+ }
+ printf("# Setting value of k_B to = %.15g\n", k_B);
+ argc -= 2;
+ argv += 2;
+ }
+
if (toupper(argv[1][0]) == 'P')
{
PERIODIC = 1;
@@ -123,7 +179,7 @@ if (argc != 9 && argc !=11)
printf( COMMAND_LINE ); printf( COMMAND_LINE );
exit(-1); exit(-1);
} }
@ -538,7 +305,7 @@ index 487871b..edb8125 100644
HIST_MIN = atof(argv[1]); HIST_MIN = atof(argv[1]);
HIST_MAX = atof(argv[2]); HIST_MAX = atof(argv[2]);
NUM_BINS = atoi(argv[3]); NUM_BINS = atoi(argv[3]);
@@ -213,13 +269,13 @@ if (!ave_pdf2) @@ -269,13 +268,13 @@ if (!ave_pdf2)
printf("couldn't allocate space for ave_pdf2: %s\n", strerror(errno)); printf("couldn't allocate space for ave_pdf2: %s\n", strerror(errno));
exit(errno); exit(errno);
} }
@ -554,7 +321,7 @@ index 487871b..edb8125 100644
i = get_numwindows(METAFILE); i = get_numwindows(METAFILE);
printf("#Number of windows = %d\n", i); printf("#Number of windows = %d\n", i);
@@ -248,7 +304,7 @@ assert(i == hist_group->num_windows); @@ -304,7 +303,7 @@ assert(i == hist_group->num_windows);
// Figure out if we have trajectories at different temperatures. // Figure out if we have trajectories at different temperatures.
// Missing temperatures are set to -1 in read_metadata, and // Missing temperatures are set to -1 in read_metadata, and
// since we require that either all trajectories specify a temperature // since we require that either all trajectories specify a temperature
@ -563,7 +330,7 @@ index 487871b..edb8125 100644
// have to check one of them // have to check one of them
if (hist_group->kT[0] > 0) if (hist_group->kT[0] > 0)
{ {
@@ -257,7 +313,7 @@ if (hist_group->kT[0] > 0) @@ -313,7 +312,7 @@ if (hist_group->kT[0] > 0)
else else
{ {
have_energy = 0; have_energy = 0;
@ -572,7 +339,7 @@ index 487871b..edb8125 100644
{ {
hist_group->kT[i] = kT; hist_group->kT[i] = kT;
} }
@@ -269,7 +325,7 @@ if (!final_f) @@ -325,7 +324,7 @@ if (!final_f)
{ {
printf("couldn't allocate space for final_f: %s\n", strerror(errno)); printf("couldn't allocate space for final_f: %s\n", strerror(errno));
exit(errno); exit(errno);
@ -581,7 +348,7 @@ index 487871b..edb8125 100644
free(HISTOGRAM); free(HISTOGRAM);
@@ -305,7 +361,8 @@ while (! is_converged(hist_group) || first ) @@ -361,7 +360,8 @@ while (! is_converged(hist_group) || first )
for (i=0; i< NUM_BINS; i++) for (i=0; i< NUM_BINS; i++)
{ {
coor = calc_coor(i); coor = calc_coor(i);
@ -591,7 +358,7 @@ index 487871b..edb8125 100644
} }
printf("\n"); printf("\n");
@@ -319,7 +376,7 @@ while (! is_converged(hist_group) || first ) @@ -375,7 +375,7 @@ while (! is_converged(hist_group) || first )
} }
} }
// Cheesy bailout if we're going on too long // Cheesy bailout if we're going on too long
@ -600,7 +367,16 @@ index 487871b..edb8125 100644
{ {
printf("Too many iterations: %d\n", iteration); printf("Too many iterations: %d\n", iteration);
break; break;
@@ -383,11 +440,11 @@ for (i=0; i< num_mc_runs; i++) @@ -408,7 +408,7 @@ for (i=0; i < NUM_BINS; i++)
}
// Compute the free energy from the normalized probability
-bin_min = calc_free(free_ene, prob,kT);
+ calc_free(free_ene, prob,kT);
// Do the requested number of bootstrap monte carlo error analysis runs.
if (num_mc_runs <= 0)
@@ -439,11 +439,11 @@ for (i=0; i< num_mc_runs; i++)
//printf("Faking %d: %d %d\n", i,j,hp->num_points); //printf("Faking %d: %d %d\n", i,j,hp->num_points);
num_used = hp->last - hp->first + 1; num_used = hp->last - hp->first + 1;
mk_new_hist(hp->cum, hp->data, num_used, hp->num_mc_samples, &idum); mk_new_hist(hp->cum, hp->data, num_used, hp->num_mc_samples, &idum);
@ -614,7 +390,7 @@ index 487871b..edb8125 100644
// perform WHAM iterations on the fake data sets // perform WHAM iterations on the fake data sets
iteration = 0; iteration = 0;
first = 1; first = 1;
@@ -403,7 +460,7 @@ for (i=0; i< num_mc_runs; i++) @@ -459,7 +459,7 @@ for (i=0; i< num_mc_runs; i++)
printf("Too many iterations: %d\n", iteration); printf("Too many iterations: %d\n", iteration);
break; break;
} }
@ -623,7 +399,7 @@ index 487871b..edb8125 100644
printf("#MC trial %d: %d iterations\n", i, iteration); printf("#MC trial %d: %d iterations\n", i, iteration);
printf("#PMF values\n"); printf("#PMF values\n");
// accumulate the average and stdev of the resulting probabilities // accumulate the average and stdev of the resulting probabilities
@@ -419,18 +476,19 @@ for (i=0; i< num_mc_runs; i++) @@ -475,18 +475,19 @@ for (i=0; i< num_mc_runs; i++)
for (j=0; j < NUM_BINS; j++) for (j=0; j < NUM_BINS; j++)
{ {
pdf = -kT*log(prob[j]); pdf = -kT*log(prob[j]);
@ -647,7 +423,7 @@ index 487871b..edb8125 100644
for (i=0; i < NUM_BINS; i++) for (i=0; i < NUM_BINS; i++)
{ {
ave_p[i] /= (double)num_mc_runs; ave_p[i] /= (double)num_mc_runs;
@@ -457,12 +515,12 @@ if (!FREEFILE) @@ -513,12 +514,12 @@ if (!FREEFILE)
for (i=0; i< NUM_BINS; i++) for (i=0; i< NUM_BINS; i++)
{ {
coor = calc_coor(i); coor = calc_coor(i);
@ -663,7 +439,7 @@ index 487871b..edb8125 100644
} }
exit(errno); exit(errno);
@@ -470,38 +528,37 @@ if (!FREEFILE) @@ -526,38 +527,37 @@ if (!FREEFILE)
else else
{ {
// write out header // write out header
@ -714,7 +490,7 @@ index 487871b..edb8125 100644
} }
} }
@@ -515,7 +572,7 @@ exit(0); @@ -571,7 +571,7 @@ exit(0);
/* /*
* Perform a single WHAM iteration * Perform a single WHAM iteration
*/ */
@ -723,7 +499,7 @@ index 487871b..edb8125 100644
int have_energy) int have_energy)
{ {
int i,j; int i,j;
@@ -535,9 +592,9 @@ for (i=0; i<NUM_BINS; i++) @@ -591,9 +591,9 @@ for (i=0; i<NUM_BINS; i++)
num += (double) get_histval( &(hist_group->hists[j]),i); num += (double) get_histval( &(hist_group->hists[j]),i);
bias = calc_bias(hist_group,j,coor); bias = calc_bias(hist_group,j,coor);
bf = exp((hist_group->F_old[j] - bias) / hist_group->kT[j]); bf = exp((hist_group->F_old[j] - bias) / hist_group->kT[j]);
@ -736,27 +512,3 @@ index 487871b..edb8125 100644
* number of points. * number of points.
*/ */
if (have_energy) if (have_energy)
diff --git a/wham/wham.h b/wham/wham.h
index aacc1e8..7d509f2 100644
--- a/wham/wham.h
+++ b/wham/wham.h
@@ -15,14 +15,16 @@ extern double kT;
extern int NUM_BINS;
extern int PERIODIC;
extern double PERIOD;
+extern double k_B;
+
// Some predefined periodic units
#define DEGREES 360.0
#define RADIANS 6.28318530717959
-#define k_B 0.001982923700 // Boltzmann's constant in kcal/mol K
-//#define k_B 0.0083144621 // Boltzmann's constant kJ/mol-K
-//#define k_B 1.0 // Boltzmann's constant in reduced units
+#define k_B_DEFAULT 0.001982923700 // Boltzmann's constant in kcal/mol K
+//#define k_B_DEFAULT 0.0083144621 // Boltzmann's constant kJ/mol-K
+//#define k_B_DEFAULT 1.0 // Boltzmann's constant in reduced units
// global (untrimmed) histogram, global to prevent reallocation