Linkdata not refreshing graph

I have code for a battery controler i'm making, and as part of that i want to display some live results as it continues running. The whole system runs in a repreating while loop which you can see below(have removed some code to make it legible).

while On = 'true'

Incorrect use of '=' operator. Assign a value to a variable using '=' and compare values for equality using '=='.

    
    %% Initialise Display
    Display = figure('Name','Controler Display','NumberTitle','off');
        tiledlayout(2,1)
        ax1 = nexttile;
        plot(ax1,Display_timebase,Display_Power_cmd, "DisplayName","ESS Power Command (kW)")
        title 'ESS input/output'
        hold on

        plot(ax1,Display_timebase,Display_Grid_Demand,"DisplayName","Grid Demand")
        plot(ax1,Display_timebase,Display_Available_Power, "DisplayName","Available Power (kW)")
        ylim([-300 320])
        legend
        xline(0)
        hold off
        ylabel("ESS Power in/output")
        xlabel("Time")
        xlim([-12 48])

        ax2 = nexttile;
        plot(ax2,Display_timebase,Display_ESS_SoC)
        title 'SoC over time'
        ylim([0 1.05])
        ylabel("ESS SoC")
        xlabel("Time")
        xlim([-12 48])
        xline(0)

        linkdata(Display,'on')
        drawnow
        
        
        %%%%%%%%%%%
        %% Additional Code
        %%%%%%%%%%%
        
        %% Update Display values
        Display_Power_cmd = [Historical_power_cmd Navigator_Outputs.Power_cmd'];
        Display_Grid_Demand = [Historical_Grid_Demand Navigator_Outputs.Grid_Demand'];
        Display_Available_Power = [Historical_Available_Power Mapper_Outputs.Available_Power'];
        Display_ESS_SoC = [Historical_SoC ESS_SoC_array'];
        
        drawnow
        
end

I'm aware that being in a while loop suppresses figure updates, hence why i've included the drawnows but my figures still refuse to update. What am i doing wrong here?

Answer 1

[Steven Lord]

As written, this is going to recreate the figure and the plots each time through the while loop. Do you want to move those ahead of the while loop and only update the variables in the loop?

Can you check that the data linkage was established correctly? From the first entry in the Tips section on the linkdata documentation page, "If linkdata cannot unambiguously identify data sources for a chart, then the chart will not synchronize with workspace variables. If you call linkdata and your chart does not update when you change a variable, then open the Linked Plot Data Sources dialog box by calling linkdata showdialog and manually link the chart to its data sources."

[Alex]

Yes! This was the answer - the data was not correctly linked and so wasnt accepting the updates. Looking at the documentation for this it only seems to be able to do one data source per axis, is there a way to have multiple lines be linked?

ax1_Plot.XDataSource = 'Display_timebase';
ax1_Plot.YDataSource = 'Display_Power_cmd';

somethink akin to

ax1_Plot.YDataSource2 = 'Display_Power_cmd';