Why is my errorbar not the same in each direction?
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I have a problem with my errorbars in the figure at the bottom. I want my standard deviation to be the same value in both the negative and postive vertical direction. However, the values are not the same (example glucose 2nd point).
growth = readtable("growthWT2.xlsx")
time = growth.Time_h_;
timeOD = growth.Time_h__1;
DO_1 = growth.O21;
DO_2 = growth.O22;
DO_3 = growth.O23;
mean_DO = growth.MeanO2;
S_DO = [DO_1 DO_2 DO_3];
stand_DO = std(S_DO,0,2);
pH_1 = growth.pH1;
pH_2 = growth.pH2;
pH_3 = growth.pH3;
mean_pH = growth.meanPH;
S_pH = [pH_1 pH_2 pH_3];
stand_pH = std(S_pH,0,2);
Bio_1 = growth.biomass1;
Bio_2 = growth.biomass2;
Bio_3 = growth.biomass3;
mean_bio = growth.MeanBio;
S_bio = [Bio_1 Bio_2 Bio_3];
stand_bio = std(S_bio,0,2);
glu_1 = growth.glucose1;
glu_2 = growth.glucose2;
glu_3 = growth.glucose2_1;
mean_glu = growth.meanGlucose;
S_glu = [glu_1 glu_2 glu_3];
stand_glu = std(S_glu,0,2);
ace_1 = growth.acetate1;
ace_2 = growth.acetate2;
ace_3 = growth.acetate3;
mean_ace = growth.meanAcetate;
S_ace = [ace_1 ace_2 ace_3];
stand_ace = std(S_ace,0,2);
% mean values
t = tiledlayout(2,1);
nexttile
yyaxis left
pDO = fill([time; flip(time)], [mean_DO+stand_DO; flip(mean_DO-stand_DO)], 'b', 'FaceAlpha', 0.3, 'EdgeColor', 'none');
hold on
p1DO = plot(time, mean_DO, '-', 'Color', '[0 0.4470 0.7410]');
ylabel('DO%', 'Color', 'k')
yyaxis right
pPH = fill([time; flip(time)], [mean_pH+stand_pH; flip(mean_pH-stand_pH)], 'r', 'FaceAlpha', 0.3, 'EdgeColor', 'none');
hold on
p1PH = plot(time,mean_pH, '-', 'Color', '[0.6350 0.0780 0.1840]');
ylabel('pH', 'Color', 'k')
legend([p1DO p1PH], {'DO' ,'pH'})
ylim([6.7 7.4])
ax = gca;
ax.YAxis(1).Color = 'k';
ax.YAxis(2).Color = 'k';
nexttile
yyaxis left
pOD = plot(timeOD,mean_bio,'-o', 'Color','[0.4940 0.1840 0.5560]', 'MarkerFaceColor', '[0.4940 0.1840 0.5560]');
hold on
errorbar(timeOD, mean_bio, stand_bio, 'LineStyle', 'none', 'Color', '[0.4940 0.1840 0.5560]')
ylabel('Biomass [g/L]', 'Color', 'k')
yyaxis right
pGLU = plot(timeOD,glu_1, '-s', 'Color','[0.8500 0.3250 0.0980]', 'MarkerFaceColor', '[0.8500 0.3250 0.0980]');
hold on
errorbar(timeOD, mean_glu, stand_glu, 'LineStyle', 'none', 'Color', '[0.8500 0.3250 0.0980]')
hold off
hold on
pACE = plot(timeOD,ace_1, '-^', 'Color','[0.4660 0.6740 0.1880]', 'MarkerFaceColor', '[0.4660 0.6740 0.1880]');
hold on
errorbar(timeOD, mean_ace, stand_ace, 'LineStyle', 'none', 'Color', '[0.4660 0.6740 0.1880]')
ylabel('Glucose and acetate [g/L]', 'Color', 'k')
legend([pOD pGLU pACE], {'Biomass' ,'Glucose', 'Acetate'})
ax = gca;
ax.YAxis(1).Color = 'k';
ax.YAxis(2).Color = 'k';
xlabel(t,'Time [h]')
Accepted Answer
The errorbars are centered around the means (e.g., mean_glu), but the other lines plotted with markers are not using the means (e.g., glu_1).
I'll set the errorbars LineStyle to '--' in the plot below to highlight the difference. Note that, e.g., the glucose errorbar at Time=3h is centered on the dotted line (which is at approx. 3.34) but not the square marker (which is at approx. 3.80).
growth = readtable("growthWT2.xlsx")
time = growth.Time_h_;
timeOD = growth.Time_h__1;
DO_1 = growth.O21;
DO_2 = growth.O22;
DO_3 = growth.O23;
mean_DO = growth.MeanO2;
S_DO = [DO_1 DO_2 DO_3];
stand_DO = std(S_DO,0,2);
pH_1 = growth.pH1;
pH_2 = growth.pH2;
pH_3 = growth.pH3;
mean_pH = growth.meanPH;
S_pH = [pH_1 pH_2 pH_3];
stand_pH = std(S_pH,0,2);
Bio_1 = growth.biomass1;
Bio_2 = growth.biomass2;
Bio_3 = growth.biomass3;
mean_bio = growth.MeanBio;
S_bio = [Bio_1 Bio_2 Bio_3];
stand_bio = std(S_bio,0,2);
glu_1 = growth.glucose1;
glu_2 = growth.glucose2;
glu_3 = growth.glucose2_1;
mean_glu = growth.meanGlucose;
S_glu = [glu_1 glu_2 glu_3];
stand_glu = std(S_glu,0,2);
ace_1 = growth.acetate1;
ace_2 = growth.acetate2;
ace_3 = growth.acetate3;
mean_ace = growth.meanAcetate;
S_ace = [ace_1 ace_2 ace_3];
stand_ace = std(S_ace,0,2);
% mean values
t = tiledlayout(2,1);
nexttile
yyaxis left
pDO = fill([time; flip(time)], [mean_DO+stand_DO; flip(mean_DO-stand_DO)], 'b', 'FaceAlpha', 0.3, 'EdgeColor', 'none');
hold on
p1DO = plot(time, mean_DO, '-', 'Color', '[0 0.4470 0.7410]');
ylabel('DO%', 'Color', 'k')
yyaxis right
pPH = fill([time; flip(time)], [mean_pH+stand_pH; flip(mean_pH-stand_pH)], 'r', 'FaceAlpha', 0.3, 'EdgeColor', 'none');
hold on
p1PH = plot(time,mean_pH, '-', 'Color', '[0.6350 0.0780 0.1840]');
ylabel('pH', 'Color', 'k')
legend([p1DO p1PH], {'DO' ,'pH'})
ylim([6.7 7.4])
ax = gca;
ax.YAxis(1).Color = 'k';
ax.YAxis(2).Color = 'k';
nexttile
yyaxis left
pOD = plot(timeOD,mean_bio,'-o', 'Color','[0.4940 0.1840 0.5560]', 'MarkerFaceColor', '[0.4940 0.1840 0.5560]');
hold on
errorbar(timeOD, mean_bio, stand_bio, 'LineStyle', '--', 'Color', '[0.4940 0.1840 0.5560]')
ylabel('Biomass [g/L]', 'Color', 'k')
mean_glu
glu_1
yyaxis right
pGLU = plot(timeOD,glu_1, '-s', 'Color','[0.8500 0.3250 0.0980]', 'MarkerFaceColor', '[0.8500 0.3250 0.0980]');
hold on
errorbar(timeOD, mean_glu, stand_glu, 'LineStyle', '--', 'Color', '[0.8500 0.3250 0.0980]')
hold off
hold on
pACE = plot(timeOD,ace_1, '-^', 'Color','[0.4660 0.6740 0.1880]', 'MarkerFaceColor', '[0.4660 0.6740 0.1880]');
hold on
errorbar(timeOD, mean_ace, stand_ace, 'LineStyle', '--', 'Color', '[0.4660 0.6740 0.1880]')
ylabel('Glucose and acetate [g/L]', 'Color', 'k')
legend([pOD pGLU pACE], {'Biomass' ,'Glucose', 'Acetate'})
ax = gca;
ax.YAxis(1).Color = 'k';
ax.YAxis(2).Color = 'k';
xlabel(t,'Time [h]')
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