Change Y-Axis position to desired origin?

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Elnaz P
Elnaz P on 9 Jul 2020
Commented: Steven Lord on 10 Jul 2020
Hi,
could someone help me how I can change origin point of y axis to (0-20) point. In fact I want to shift Y axis to point (0-20) but I don't have any idea.
hold on
ax = gca;
ax.XAxisLocation = 'origin';
ax.YAxisLocation = 'origin';
origin = (0-20);
n= ["-240-260";"-220-240";"-200-220";"-180-200";"-160-180";"-140-160";"-120-140";"-100-120";"-80-100";"-60-80";"-40-60";"-20-40";"0-20";"0+20";"+20+40";"+40+60";"+60+80";"+80+100";"+100+120";"+120+140";"+140+160";"+160+180";"+180+200";"+200+220";"+220+240"];
y1 = [0,0,0,0,0,0,0,0,0,0,0,0.032258064516129,0.548387096774194,0.387096774193548,0.032258064516129,0,0,0,0,0,0,0,0,0,0];
y2 = [0.032258065,0.064516129,0,0,0.064516129,0.064516129,0.032258065,0.064516129,0.129032258,0.225806452,0.161290323,0.096774194,0.032258065,0.032258065,0,0,0,0,0,0,0,0,0,0,0];
y3 = [0,0,0,0.025641026,0.025641026,0.051282051,0.128205128,0,0,0.051282051,0,0.076923077,0.307692308,0.128205128,0,0.025641026,0,0.051282051,0.025641026,0,0.051282051,0.025641026,0.025641026,0,0];
x = categorical(n, n);
plot(x,y1,'-ko', x,y2,'-ks',x,y3,'-k^','LineWidth',1,'MarkerEdgeColor','k','MarkerFaceColor','k','MarkerSize',7);
hold off
  5 Comments

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Answers (2)

Sugar Daddy
Sugar Daddy on 9 Jul 2020
Edited: Sugar Daddy on 9 Jul 2020

Scale Up data

hold on
ax = gca;
ax.XAxisLocation = 'origin';
ax.YAxisLocation = 'origin';
origin = (0-20);
n= ["-240-260";"-220-240";"-200-220";"-180-200";"-160-180";"-140-160";"-120-140";"-100-120";"-80-100";"-60-80";"-40-60";"-20-40";"0-20";"0+20";"+20+40";"+40+60";"+60+80";"+80+100";"+100+120";"+120+140";"+140+160";"+160+180";"+180+200";"+200+220";"+220+240"];
y1 = [0,0,0,0,0,0,0,0,0,0,0,0.032258064516129,0.548387096774194,0.387096774193548,0.032258064516129,0,0,0,0,0,0,0,0,0,0];
y2 = [0.032258065,0.064516129,0,0,0.064516129,0.064516129,0.032258065,0.064516129,0.129032258,0.225806452,0.161290323,0.096774194,0.032258065,0.032258065,0,0,0,0,0,0,0,0,0,0,0];
y3 = [0,0,0,0.025641026,0.025641026,0.051282051,0.128205128,0,0,0.051282051,0,0.076923077,0.307692308,0.128205128,0,0.025641026,0,0.051282051,0.025641026,0,0.051282051,0.025641026,0.025641026,0,0];
x = categorical(n, n);
mv = max(max([y1;y2;y3]));
y1 = y1/mv*20;
y2 = y2/mv*20;
y3 = y3/mv*20;
plot(x,y1,'-ko', x,y2,'-ks',x,y3,'-k^','LineWidth',1,'MarkerEdgeColor','k','MarkerFaceColor','k','MarkerSize',7);

Change Ytick Label

hold on
ax = gca;
ax.XAxisLocation = 'origin';
ax.YAxisLocation = 'origin';
origin = (0-20);
n= ["-240-260";"-220-240";"-200-220";"-180-200";"-160-180";"-140-160";"-120-140";"-100-120";"-80-100";"-60-80";"-40-60";"-20-40";"0-20";"0+20";"+20+40";"+40+60";"+60+80";"+80+100";"+100+120";"+120+140";"+140+160";"+160+180";"+180+200";"+200+220";"+220+240"];
y1 = [0,0,0,0,0,0,0,0,0,0,0,0.032258064516129,0.548387096774194,0.387096774193548,0.032258064516129,0,0,0,0,0,0,0,0,0,0];
y2 = [0.032258065,0.064516129,0,0,0.064516129,0.064516129,0.032258065,0.064516129,0.129032258,0.225806452,0.161290323,0.096774194,0.032258065,0.032258065,0,0,0,0,0,0,0,0,0,0,0];
y3 = [0,0,0,0.025641026,0.025641026,0.051282051,0.128205128,0,0,0.051282051,0,0.076923077,0.307692308,0.128205128,0,0.025641026,0,0.051282051,0.025641026,0,0.051282051,0.025641026,0.025641026,0,0];
x = categorical(n, n);
mv = max(max([y1;y2;y3]));
plot(x,y1,'-ko', x,y2,'-ks',x,y3,'-k^','LineWidth',1,'MarkerEdgeColor','k','MarkerFaceColor','k','MarkerSize',7);
ax.YTickLabel= string(linspace(0,20,length(ax.YTickLabel)));
  2 Comments
Elnaz P
Elnaz P on 9 Jul 2020
Yes I gonna shift Y axis from left on point 0-20, but by change Ytick Label it doesn't work yet

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Steven Lord
Steven Lord on 9 Jul 2020
I don't believe the axis ruler that is used when you plot using categorical data supports moving the axis location. In the situation you described we humans can see a reasonable definition for what 'origin' should probably mean (the bin whose label includes 0) but MATLAB can't see that (why is the bin whose name starts with the character '0' special?) In addition, if I were to try to place the axis at the 'origin' for the following plot where should the axis be placed and why should it be placed there?
c = ["cat", "broccoli", "sapphire"];
x = categorical(c, c);
h = plot(x, [4 7 1]);
ax = ancestor(h, 'axes');
ax.YAxisLocation = "origin";
  2 Comments
Steven Lord
Steven Lord on 10 Jul 2020
You can't move the axis, but you could put a dividing line.
n= ["-240-260";"-220-240";"-200-220";"-180-200";"-160-180";"-140-160";"-120-140"; ...
"-100-120";"-80-100";"-60-80";"-40-60";"-20- 40";"0-20";"0+20";"+20+40";...
"+40+60";"+60+80";"+80+100";"+100+120";"+120+140";"+140+160";"+160+180";...
"+180+200";"+200+220";"+220+240"];
y1 = [0,0,0,0,0,0,0,0,0,0,0,0.04,0.32,0.56,0.08,0,0,0,0,0,0,0,0,0,0];
y2 = [0,0.05,0.05,0.05,0,0.1,0,0,0.2,0.3,0.1,0.1,0.05,0,0,0,0,0,0,0,0,0,0,0,0];
x=categorical(n, n);
plot(x,y1,'r--o', x,y2,'k--o');
% Category 13 in x is "0-20"
xline(x(13))

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