MATLAB Not plotting table in workspace

Hi, I'm trying to plot a 2d graph from a table in my workspace, but it only shows numbers in the command window and doesn't plot the graph. The first column is the time step and the second and third columns are temperature values.

Below is my code:

The table is called "battery_half" and is a 7201*3 table.

x1=battery_half(:,1);
y1=battery_half(:,2);
y2=battery_half(:,3);

plot(x1, y1, y2, 'LineWidth', 2.0)
xline(0, 'LineWidth', 1.0)
yline(0, 'LineWidth', 1.0)


xlabel('Flow time (sec)')
ylabel('Temperature (C)')
legend('Computational (0.5C-DC)','Experimental (0.5C-DC)')
ax=gca;
ax.Fontsize=12;
figure(gcf)

Answer 1

[Dyuman Joshi]

When you use parenthesis, (), on a table, the output is also a table.

Use curly brackets, {}, to access the data inside the table. For more information, refer to Access Data in Tables

%              v   v
x1=battery_half{:,1};
y1=battery_half{:,2};
y2=battery_half{:,3};

Also, the syntax to plot multiple graphs using a single plot() is

plot(x1, y1, x2, y2, ...)

If x2 is same as x1, use x1 instead. But both set of coordinates have to be specified for each plot.

plot(x1, y1, x1, y2, 'LineWidth', 2.0)

Additionally, the property is 'FontSize', so you need to capitalize the 's'.

And the last line of code is redundant, you can remove it.

[Dana Kang]

Thank you for your reply.

I edited the code like the following, but it still doesn't seem to plot properly : (

I also attached the table I'm trying to access the data from.

I would appreciate any advice, thanks!

x1=battery_half{:,1};
y1=battery_half{:,2};
y2=battery_half{:,3};

plot(x1, y1, x1, y2, 'LineWidth', 2.0)
xline(0, 'LineWidth', 1.0)
yline(0, 'LineWidth', 1.0)

xlabel('Flow time (sec)')
ylabel('Temperature (C)')
legend('Computational (0.5C-DC)','Experimental (0.5C-DC)')
ax=gca;
ax.FontSize=12;

[Dyuman Joshi]

Your data is in a numeric array.

Note that Table in MATLAB has a specific meaning i.e. it is a distinct data type - Tables

The plot appears with curves now.

Let me know if you still have some unresolved query.

load('battery_half.mat')
whos

  Name                 Size             Bytes  Class     Attributes

  ans                  1x41                82  char                
  battery_half      7201x3             172824  double              
  cmdout               1x33                66  char                

x1=battery_half(:,1);
y1=battery_half(:,2);
y2=battery_half(:,3);

plot(x1, y1, x1, y2, 'LineWidth', 2.0)
xline(0, 'LineWidth', 1.0)
yline(0, 'LineWidth', 1.0)

xlabel('Flow time (sec)')
ylabel('Temperature (C)')
legend('Computational (0.5C-DC)','Experimental (0.5C-DC)', 'Location', 'Best')
ax=gca;
ax.FontSize=12;

[Dana Kang]

Oh that seems to work, thank you very much! : )