Dimensions of arrays being concatenated are not consistent.

%% Connection
a = arduino('COM4', 'uno');
%%Parameters
T = 100;        % number of samples to view on plot
nCount = 1;
voltageS1 = zeros(T,1);
voltageS2 = zeros(T,1);
avrgVolt = zeros(T,1);
avrgVolt1 = zeros(T,1);
input=0;

while 1
    for i= 1:1:100
        
        if nCount == T
            voltageS1 = voltageS1(2:end, :);
            voltageS2 = voltageS2(2:end, :);
            avrgVolt = avrgVolt(2:end, :);
            avrgVolt1=avrgVolt1(2:end, :);
        else
            nCount = nCount + 1;
        end
        voltageS1(nCount,:) = readVoltage(a, 'A0'); % Sensor 1 connected to input A0 .
        voltageS2(nCount,:) = readVoltage(a, 'A1'); % Sensor 2 connected to input A1 .
        avrgVolt1(nCount,:) = ((voltageS1(nCount,:)/5)-(voltageS2(nCount,:)/5));
        avrgVolt(nCount,:) = ((voltageS1(nCount,:))-(voltageS2(nCount,:)));
        input=[input ,avrgVolt ]
        dataPlot = [voltageS1, voltageS2, avrgVolt];
        plot(1:T,dataPlot)
        title(sprintf('A0 = %fV A1 = %fV Avg = %f avrgVolt1= %f', (voltageS1(nCount)), (voltageS2(nCount)) , avrgVolt(nCount,:), avrgVolt1(nCount,:)))
        grid on;
        axis([0 T -5 5])
        xlabel('Samples') % x-axis label
        ylabel('Voltage') % y-axis label
        drawnow
    end

[Jan]

Please use the tools for code formatting and post a copy of the complete error message. Then the readers do not have to guess, in which line the error occurs.

input=[input ,avrgVolt ]                        % Here
dataPlot = [voltageS1, voltageS2, avrgVolt];    % or here?

Answer 1

[Jan]

The message means, that you cannot concatente arrays horizontally, if they have a different number of rows. Or vertically, if the number of columns differ.

Use the debugger to find the problem. Type in the command window:

dbstop if error

Now run your code again. If Matlab stops at the error, check the dimensions of the arrays to be concatented.

[Abdulrhman Khaled Elnagr]

I already figured it out thank you