gnuplothistogram
gnuplot, problem with histogram rowstacked columns
I'm creating rowstacked histograms from data files. Here is the script i'm using:
set title "Heat exchanger surface at the optimal solution"
set termopt enhanced
set grid
set key top left
#set key off
set xlabel "Working fluid"
set ylabel "A [m^{2}]"
#set xrange[0.0:0.0]
#set yrange[0.0:0.0]
set yrange[0.0:10.0]
set offsets 0.1,0.1,0,0
#set datafile missing '0.000000000000000000e+00'
#set datafile missing '0.000000'
set style data histogram
#set style histogram clustered
set style histogram rowstacked
#set style fill solid border
set style fill solid 1.00 border -1
set boxwidth 0.5
#set xtics ("R124" "R124", "Isobutane" "Isobutane", "R245fa" "R245fa", "Isopentane" "Isopentane", "Cyclopentane" "Cyclopentane")
#set xtics nomirror rotate by -45 scale 0 font ",8"
plot\
newhistogram "conventional cycle",\
"parasub_t3_dtpprec_5.txt" using ($26):xticlabels(2) notitle lc "#E74C3C", '' using ($29) notitle lc rgb "#3498DB",\
newhistogram "recuperative cycle",\
"parasub_t3_dtpprec_5.txt" using ($27):xticlabels(2) title "A_{evap}" lc "#E74C3C", '' using ($30) title "A_{cond}" lc rgb "#3498DB", '' using ($28) title "A_{rec}" lc rgb "#1ABC9C",\
As long as there are multiple lines of data, the script is working as intended. For instance, the following data file:
#(1) DTsup [oC] (2) T3 [oC] (3) pr [-] (4) phigh [Pa] (5) plow [Pa] (6) nth [-] (7) nthr [-] (8) wnet [J/kg] (9) wp [J/kg] (10) we [J/kg] (11) bwr [-] (12) Toout [K] (13) Tooutr [K] (14) Twout [K] (15) Twoutr [K] (16) mo [kg/s] (17) mor [kg/s] (18) mwf [kg/s] (19) mw [kg/s] (20) mwr [kg/s] (21) qevap [J/kg] (22) qevapr [J/kg] (23) qrec [J/kg] (24) qcond [J/kg] (25) qcondr [J/kg] (26) Aevap [m^2] (27) Aevapr [m^2] (28) Arec [m^2] (29) Acond [m^2] (30) Acondr [m^2] (31) Qin [W] (32) Qinr [W] (33) mbm [kg/s] (34) mbmr [kg/s] (35) Exde [W] (36) Exdp [W] (37) Exdevap [W] (38) Exdevapr [W] (39) Exdrec [W] (40) Exdcond [W] (41) Exdcondr [W] (42) nex [-] (43) nexr [-] (44) nthchp [-] (45) nthchpr [-] (46) nelchp [-] (47) nelchpr [-] (48) nchp [-] (49) nchpr [-] (50) PHR [-] (51) PHRr [-] (52) PESR [-] (53) PESRr [-]
0.000000 100.00 6.615031 722136.079363 109165.948144 0.120395 0.133603 54105.033173 1255.690368 55360.723541 0.022682 323.399196 342.291477 301.256224 300.341368 0.865955 0.833098 1.026809 11.974715 11.980348 449397.650120 404968.415600 44429.234520 395292.616947 350863.382427 1.749529 1.580108 0.905206 4.741577 4.431979 485732.339365 437710.913321 0.030358 0.027357 12646.313088 249.135367 75334.789746 68040.736716 1051.434109 10361.313998 7598.925672 0.797025 0.795329 0.835625 0.823077 0.102937 0.114231 0.938563 0.937308 0.123186 0.138785 0.193811 0.206780
0.000000 125.00 10.950918 1195467.347000 109165.948144 0.143171 0.165337 69590.450251 2224.353135 71814.803386 0.030973 323.636526 351.135647 301.686140 300.350555 0.728765 0.695743 0.798322 9.315172 9.314445 486065.769850 420901.502320 65164.267530 416475.319599 351311.052069 1.717772 1.493149 0.995391 3.798056 3.490943 408459.763072 353699.722503 0.025529 0.022106 12367.695114 342.877062 51440.216065 43942.601168 1342.638004 9868.981536 5917.282287 0.818783 0.819301 0.813988 0.792930 0.122411 0.141363 0.936399 0.934293 0.150384 0.178279 0.215916 0.236295
0.000000 150.00 17.111919 1868038.858437 109165.948144 0.159571 0.190207 82665.881533 3599.317677 86265.199210 0.041724 323.971907 358.988006 302.090891 300.366300 0.654590 0.623571 0.672049 7.826862 7.838158 518050.203910 434609.996396 83440.207514 435384.322377 351944.114863 1.701833 1.434744 1.044041 3.277773 2.973168 366479.289887 307451.983717 0.022905 0.019216 12183.225690 466.601844 38046.705189 30728.594794 1564.632186 9976.733938 4991.692881 0.834443 0.837585 0.798407 0.769303 0.136433 0.162627 0.934841 0.931930 0.170882 0.211395 0.231097 0.257935
0.000000 175.00 25.632899 2798239.736148 109165.948144 0.170657 0.205830 91441.090019 5498.220729 96939.310748 0.056718 324.566507 362.694767 302.260397 300.382724 0.613275 0.584904 0.607556 7.087607 7.087352 535819.088490 444255.015085 91564.073405 444377.998471 352813.925066 1.589821 1.335576 1.040693 2.995781 2.711167 342673.623125 284115.439112 0.021417 0.017757 12237.465845 643.490745 30526.883339 23645.251436 1591.296117 9834.879936 4528.051268 0.844626 0.849901 0.787876 0.754461 0.145911 0.175985 0.933788 0.930446 0.185196 0.233259 0.241029 0.270913
gives this graph:
In the case of single row data like the following:
#(1) DTsup [oC] (2) T3 [oC] (3) pr [-] (4) phigh [Pa] (5) plow [Pa] (6) nth [-] (7) nthr [-] (8) wnet [J/kg] (9) wp [J/kg] (10) we [J/kg] (11) bwr [-] (12) Toout [K] (13) Tooutr [K] (14) Twout [K] (15) Twoutr [K] (16) mo [kg/s] (17) mor [kg/s] (18) mwf [kg/s] (19) mw [kg/s] (20) mwr [kg/s] (21) qevap [J/kg] (22) qevapr [J/kg] (23) qrec [J/kg] (24) qcond [J/kg] (25) qcondr [J/kg] (26) Aevap [m^2] (27) Aevapr [m^2] (28) Arec [m^2] (29) Acond [m^2] (30) Acondr [m^2] (31) Qin [W] (32) Qinr [W] (33) mbm [kg/s] (34) mbmr [kg/s] (35) Exde [W] (36) Exdp [W] (37) Exdevap [W] (38) Exdevapr [W] (39) Exdrec [W] (40) Exdcond [W] (41) Exdcondr [W] (42) nex [-] (43) nexr [-] (44) nthchp [-] (45) nthchpr [-] (46) nelchp [-] (47) nelchpr [-] (48) nchp [-] (49) nchpr [-] (50) PHR [-] (51) PHRr [-] (52) PESR [-] (53) PESRr [-]
0.000000 100.00 5.341869 2378728.179011 445298.822341 0.112752 0.114041 19161.460322 1801.363568 20962.823891 0.085931 324.451846 326.146202 300.506605 300.412249 0.927877 0.922580 2.899338 14.211155 14.212341 169943.894226 168023.173176 1920.721050 150782.433904 148861.712854 1.530831 1.516876 0.148261 5.350023 5.288725 518657.725517 512795.809645 0.032416 0.032050 14432.854403 1006.224611 85187.593357 84077.690879 91.521847 9284.760286 9108.082145 0.788085 0.787993 0.842886 0.841661 0.096403 0.097505 0.939289 0.939166 0.114372 0.115848 0.186111 0.187420
the two columns collapse into one, like the next plot suggests:
I honestly don't know how to handle this.
In addition, i was wondering if there is a way to keep box width constant, regardless of the number of columns.
Thank you in advance.
Edit: Thanks to theozh and ethan's elegant work-around solutions, the issue is resolved. It would seem that this behavior is a bug, since the original script fails specifically in cases of single-row data files.
Solution
This behaviour looks to me like a bug (or it is my lack of understanding how histogram style works).
In general, you can limit your data to only a part of the original data via every ::a::b (check help every).
In your case, as long as b>a, it will work as expected.
However, when your data consists only of one row, i.e. you limit it to one row, e.g. a=0 and b=0 you will get the strange result you got.
The only way (so far) I could separate the bars is introducing a dummy newhistogram.
This creates a large gap which is not so nice. So, I hope there is a much better solution.
About the boxwidth, you can set it to absolute or relative values. Check help boxwidth.
Script:
### histogram rowstacked with just one row
reset session
$Data <<EOD
#(1) DTsup [oC] (2) T3 [oC] (3) pr [-] (4) phigh [Pa] (5) plow [Pa] (6) nth [-] (7) nthr [-] (8) wnet [J/kg] (9) wp [J/kg] (10) we [J/kg] (11) bwr [-] (12) Toout [K] (13) Tooutr [K] (14) Twout [K] (15) Twoutr [K] (16) mo [kg/s] (17) mor [kg/s] (18) mwf [kg/s] (19) mw [kg/s] (20) mwr [kg/s] (21) qevap [J/kg] (22) qevapr [J/kg] (23) qrec [J/kg] (24) qcond [J/kg] (25) qcondr [J/kg] (26) Aevap [m^2] (27) Aevapr [m^2] (28) Arec [m^2] (29) Acond [m^2] (30) Acondr [m^2] (31) Qin [W] (32) Qinr [W] (33) mbm [kg/s] (34) mbmr [kg/s] (35) Exde [W] (36) Exdp [W] (37) Exdevap [W] (38) Exdevapr [W] (39) Exdrec [W] (40) Exdcond [W] (41) Exdcondr [W] (42) nex [-] (43) nexr [-] (44) nthchp [-] (45) nthchpr [-] (46) nelchp [-] (47) nelchpr [-] (48) nchp [-] (49) nchpr [-] (50) PHR [-] (51) PHRr [-] (52) PESR [-] (53) PESRr [-]
0.000000 100.00 6.615031 722136.079363 109165.948144 0.120395 0.133603 54105.033173 1255.690368 55360.723541 0.022682 323.399196 342.291477 301.256224 300.341368 0.865955 0.833098 1.026809 11.974715 11.980348 449397.650120 404968.415600 44429.234520 395292.616947 350863.382427 1.749529 1.580108 0.905206 4.741577 4.431979 485732.339365 437710.913321 0.030358 0.027357 12646.313088 249.135367 75334.789746 68040.736716 1051.434109 10361.313998 7598.925672 0.797025 0.795329 0.835625 0.823077 0.102937 0.114231 0.938563 0.937308 0.123186 0.138785 0.193811 0.206780
0.000000 125.00 10.950918 1195467.347000 109165.948144 0.143171 0.165337 69590.450251 2224.353135 71814.803386 0.030973 323.636526 351.135647 301.686140 300.350555 0.728765 0.695743 0.798322 9.315172 9.314445 486065.769850 420901.502320 65164.267530 416475.319599 351311.052069 1.717772 1.493149 0.995391 3.798056 3.490943 408459.763072 353699.722503 0.025529 0.022106 12367.695114 342.877062 51440.216065 43942.601168 1342.638004 9868.981536 5917.282287 0.818783 0.819301 0.813988 0.792930 0.122411 0.141363 0.936399 0.934293 0.150384 0.178279 0.215916 0.236295
0.000000 150.00 17.111919 1868038.858437 109165.948144 0.159571 0.190207 82665.881533 3599.317677 86265.199210 0.041724 323.971907 358.988006 302.090891 300.366300 0.654590 0.623571 0.672049 7.826862 7.838158 518050.203910 434609.996396 83440.207514 435384.322377 351944.114863 1.701833 1.434744 1.044041 3.277773 2.973168 366479.289887 307451.983717 0.022905 0.019216 12183.225690 466.601844 38046.705189 30728.594794 1564.632186 9976.733938 4991.692881 0.834443 0.837585 0.798407 0.769303 0.136433 0.162627 0.934841 0.931930 0.170882 0.211395 0.231097 0.257935
0.000000 175.00 25.632899 2798239.736148 109165.948144 0.170657 0.205830 91441.090019 5498.220729 96939.310748 0.056718 324.566507 362.694767 302.260397 300.382724 0.613275 0.584904 0.607556 7.087607 7.087352 535819.088490 444255.015085 91564.073405 444377.998471 352813.925066 1.589821 1.335576 1.040693 2.995781 2.711167 342673.623125 284115.439112 0.021417 0.017757 12237.465845 643.490745 30526.883339 23645.251436 1591.296117 9834.879936 4528.051268 0.844626 0.849901 0.787876 0.754461 0.145911 0.175985 0.933788 0.930446 0.185196 0.233259 0.241029 0.270913
EOD
set title "Heat exchanger surface at the optimal solution"
set termopt enhanced
set grid
set xlabel "Working fluid"
set ylabel "A [m^{2}]"
set yrange[0.0:10.0]
set offsets 0.1,0.1,0,0
set key top left noautotitle
set style data histogram
set style histogram rowstacked
set style fill solid 1.00 border -1
set boxwidth 0.5
a=0
b=0
plot\
newhistogram "conventional cycle", \
$Data u ($26):xtic(2) every ::a::b lc rgb "#E74C3C" , \
'' u ($29) every ::a::b lc rgb "#3498DB", \
newhistogram "", '' u (0), \
newhistogram "recuperative cycle", \
'' u ($27):xtic(2) every ::a::b title "A_{evap}" lc rgb "#E74C3C", \
'' u ($30) every ::a::b title "A_{cond}" lc rgb "#3498DB", \
'' u ($28) every ::a::b title "A_{rec}" lc rgb "#1ABC9C"
### end of script
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