mean, standard deviance, variance simplify the code if possible?

Question

sydney salvador 2020-5-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/522320-mean-standard-deviance-variance-simplify-the-code-if-possible

回答： Pravin Jagtap 2020-5-4

Final_salvador.mlapp

I have a user input table, it allows data to be entered as strain as (X) and stress as (Y), is there a function that can simplify my formula that i used for mean standrad deviation and variance

also i only used strain (X) data for the computation, is it mathematically correct?

            %Data Extracted from UITable
            d = str2double (app.UITable.Data);
            
            
            %Each Point in Strain
            Px1 = d(1,1);
            Px2 = d(2,1);
            Px3 = d(3,1);
            Px4 = d(4,1);
            Px5 = d(5,1);
            Px = Px1+Px2+Px3+Px4+Px5;
            
            %Each Point in Stress
            Py1 = d(1,2);
            Py2 = d(2,2);
            Py3 = d(3,2);
            Py4 = d(4,2);
            Py5 = d(5,2);
            Py = Py1+Py2+Py3+Py4+Py5;
            
            %Young Modulus Formula
            R = Py / Px ;
            
            %Mean Formula
            M = Px / 5 ;
            
            %Standard Deviation Formula
            N = (Px1-M)^2+(Px2-M)^2+(Px3-M)^2+(Px4-M)^2+(Px5-M)^2;
            S = sqrt( N / 5 );
            
            %Variance Formula
            V = S^2;
          
            app.YoungsModulusEditField.Value = R;
            app.MeanEditField.Value = M;
            app.StdDevEditField.Value = S;
            app.VarianceEditField.Value = V;

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Answer 1

Pravin Jagtap 2020-5-4

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/522320-mean-standard-deviance-variance-simplify-the-code-if-possible#answer_430143

在 MATLAB Online 中打开

You can read the values from the matrix and calculate the mean in one line to clean up some code. For examples, replace

            %Each Point in Strain
            Px1 = d(1,1);
            Px2 = d(2,1);
            Px3 = d(3,1);
            Px4 = d(4,1);
            Px5 = d(5,1);
            Px = Px1+Px2+Px3+Px4+Px5;

with

Px = mean(d(:,1));

On similar lines you can clean up other part of code.

I would recommend you to follow the documentation links mentioned below:

For 'mean':

https://www.mathworks.com/help/matlab/ref/mean.html

For 'Standard deviation':

https://www.mathworks.com/help/matlab/ref/std.html

For 'Variance'

https://www.mathworks.com/help/matlab/ref/var.html

Hope this will help