Develop GUI using accelerometer sensor in mobile phone to collect data, filter signal, and show peaks in the signal on the mobile phone

I am facing these errors when i try to run

=== Simulation (Elapsed: 4 sec) ===

Error:Index expression out of bounds. Attempted to access element 3. The valid range is 1-1.

More information

Function 'MATLAB Function2' (#109.51.52), line 3, column 20:

"3"

Launch diagnostic report.

Error:Undefined function or variable 'z'. The first assignment to a local variable determines its class.

Function 'MATLAB Function2' (#109.196.197), line 10, column 30:

"z"

Launch diagnostic report.

Error:Errors occurred during parsing of MATLAB function 'john4/MATLAB Function2'

Error:Simulink cannot determine sizes and/or types of the outputs for block 'john4/MATLAB Function2' due to errors in the block body, or limitations of the underlying analysis. The errors might be inaccurate. Fix the indicated errors, or explicitly specify sizes and/or types for all block outputs.

Error:Simulink cannot determine sizes and/or types of the outputs for block 'john4/MATLAB Function2' due to errors in the block body, or limitations of the underlying analysis. The errors might be inaccurate. Fix the indicated errors, or explicitly specify sizes and/or types for all block outputs.

Error:Port width mismatch. Input 'Acceleration' expects a signal of size 1. The signal received is of size [1x1].

run the build on my mobile phone,

Answer 1

[Walter Roberson]

You have the Android X Y Z sensors. You extract Z from that -- a scalar. You have the Android button sensor. You extract status (pushed or not) from that -- a scalar. You multiply the scalar Z by the scalar button status, getting a scalar out. You pass that to Accleration function which does

function b = fcn(Acceleration)

z = Acceleration(:,3);

However the input is the scalar, z times button state, rather than being something with three columns.

b = filter(sgolay_coeffs, 1, z);

You have a scalar z, not a history of z. Applying a filter to a scalar is not going to do much good.

You need to use something like a buffer block; see https://www.mathworks.com/matlabcentral/answers/353831-using-savitzky-golay-filter-in-real-time-simulink-model#answer_279467