Adding Legend to Bar Graph

I have a bar graph with a mix of colors and would like to create a legend but I can't figure out where to put it within my code.

The code I'm using is as follows:

b = bar(StepsS2.Time, StepsS2.Steps);
b.FaceColor = 'flat';
for i = 1:length(StepsS2.Time)
  switch StepsS2.Action(i)
      case "Jump"
          b.CData(i,:) = [1 0 0];
      case "Run"
          b.CData(i,:) = [1 1 0];
      case "Squat"
          b.CData(i,:) = [0 1 1];
      case "Cycle"
          b.CData(i,:) = [0 0 1];
      otherwise
          b.CData(i,:) = [0 1 0];
  end
end

I've tried a variety of solutions such as:

set(b, {'DisplayName'}, {'Jump', 'Run', 'Squat', 'Cycle', 'Other'}'), which gives the following error: Error using matlab.graphics.chart.primitive.Bar/set

Value cell array handle dimension must match handle vector length.

and also

legend(b, 'Jump', 'Run', 'Squat', Cycle', 'Other'), which only displays 'Jump'

Answer 1

[Sulaymon Eshkabilov]

Hi, here is an easy solution to your exercise:

Labelit={};
LEG = {"Jump", 'Run', 'Squat', 'Cycle', 'Other'};
for ii=1:5
   b= bar(A(ii), B(ii)); hold on
   b.FaceColor = 'flat';
    Labelit{ii}=LEG{ii};
    legend(Labelit{:});
end

[Gillian Murray]

What would A and B be? I get an error saying that it's unrecognized.

[Sulaymon Eshkabilov]

A=StepsS2.Time; B=StepsS2.Steps

Or

...
b= bar(StepsS2.Time(ii), StepsS2.Steps(ii)); hold on
...

[Gillian Murray]

That worked, the accurate legend showed up on my graph but it messed up the rest of the bars when I put that code after the code I listed above. If I put the code listed above after the code you provided, I get this error: Warning: Error updating Bar.

CData must be an RGB triplet, a scalar, an M-by-1 vector the same length as X, or an M-by-3 matrix.

I didn't redefine b so this is exactly what I put in:

figure()
Labelit = {};
LEG = {'Jump', 'Run', 'Squat', 'Cycle', 'Other'};
for ii = 1:5
b = bar(StepsS2.Time(ii), StepsS2.Steps(ii)); hold on
b.FaceColor = 'flat';
Labelit{ii} = LEG{ii};
legend(Labelit{:});
end

for i = 1:length(Subject2StepsS2.Time)
switch Subject2StepsS2.ActivityType(i)
case "Jump"
b.CData(i,:) = [1 0 0];
case "Run"
b.CData(i,:) = [0 1 1];
case "Squat" 
b.CData(i,:) = [0 1 0];
case "Cycle"
b.CData(i,:) = [0 0 1];
otherwise 
b.CData(i,:) = [1 0 1];
end
end

Answer 2

[Sulaymon Eshkabilov]

If you are concerned of coloring all bars specifically, then you need to use this code:

figure()
Labelit = {};
CL = [1 0 0; 0 1 1;  0 1 0;  0 0 1; 1 0 1];
LEG = {'Jump', 'Run', 'Squat', 'Cycle', 'Other'};
for ii = 1:5
b = bar(StepsS2.Time(ii), StepsS2.Steps(ii)); hold on
b.FaceColor = 'flat';
b.CData = CL(ii,:);
Labelit{ii} = LEG{ii};
legend(Labelit{:});
end

[Gillian Murray]

It's still not working, the legend shows up just fine, but when I input the code above it produces one thick bar of 'Run' that isn't even part of my data. When I follow the code above with:

b = bar(StepsS2.Time, StepsS2.Steps);
b.FaceColor = 'flat';
for i = 1:length(StepsS2.Time)
switch StepsS2.ActivityType(i)
case "Jump"
b.CData(i,:) = [1 0 0];
case "Run"
b.CData(i,:) = [0 1 1];
case "Squat"
b.CData(i,:) = [0 1 0];
case "Cycle"
b.CData(i,:) = [0 0 1];
otherwise 
b.CData(i,:) = [1 0 1];
end
end

I still get that weird chunk of 'Run' that isn't part of my data, in addition to my actual data. There is no data for 'Run' before the blue steps of Cycle.

Answer 3

[Sulaymon Eshkabilov]

Why you keep using this useless (removed) part of your code:

for i = 1:length(StepsS2.Time)
switch StepsS2.ActivityType(i)
case "Jump"
b.CData(i,:) = [1 0 0];
case "Run"
b.CData(i,:) = [0 1 1];
case "Squat"
b.CData(i,:) = [0 1 0];
case "Cycle"
b.CData(i,:) = [0 0 1];
otherwise 
b.CData(i,:) = [1 0 1];
end
end

This is the complete code:

figure()
Labelit = {};
CL = [1 0 0; 0 1 1;  0 1 0;  0 0 1; 1 0 1];
LEG = {'Jump', 'Run', 'Squat', 'Cycle', 'Other'};
for ii = 1:5
b = bar(StepsS2.Time(ii), StepsS2.Steps(ii)); hold on
b.FaceColor = 'flat';
b.CData = CL(ii,:);
Labelit{ii} = LEG{ii};
legend(Labelit{:});
end

[Gillian Murray]

That code doesn't work, it's not pulling the data from StepsS2.ActivityType which gives each data point of time and steps a value of either jump, run, squat, cycle, or other. If I use solely the code you provided none of my data is actually there, just this random bar and the legend: