I want to know how can i create a function and use the output to plot a graph with error bar

i have a matrix called displacement with dimension 700X2 with second colum being the actual measurement data i.e displacement(:,2) The measurement error associated with the displacement measurements can be calculated by multiplying each separate measurement with the square root of 5 × 10−11.how can i create a function that will calculate the measurement error for each displacement measurement. The function should return a vector with the calculated error associated with each displacement measurement. also In my main code i need to use a code callthis function. and use the output of this function to create a plot of the displacement measurements with error bars associated with the measurement errors included for each data point. how can i do this [the first colum is a timestamp and second colum is the actual measurement]

Answer 1

[Star Strider]

Here’s one approach:

M  = [1:20;  rand(1,20)]';                          % Create Data

fun = @(M) [M(:,1)  M(:,2)  M(:,2)*sqrt(5E-11)];

R = fun(M);

figure(1)
errorbar(R(:,1), R(:,2), R(:,3))                    % ‘Regular’ Error Bar Plot
grid

figure(2)
plot(R(:,1), R(:,2), '-b')                          % Plot Blue Line Data
hold on
errorbar(R(:,1), R(:,2), R(:,3), '.r')              % Plot Red Error Bars
hold off
grid