MATLAB: Need to store for-loop values in array

arrayfor loopMATLABtable

% Hi, I want to store the approximation for each k value that I have here in this code into an array so that I can print it out as a table.
% but I can't figure out how to do that.
% Any help appreciated.  Thank you
for k = 1:10     
    x = pi/5;      
    approximation = (-1^(k-1))*((x^(2*k-1))/(2*k-1));
    prevApprox = (-1^(k-2))*((x^(2*k-2))/(2*k-2));
    true = atan(x);
    trueError = ((true - approximation) / true)*100;
    approxError = ((approximation - prevApprox)/approximation)*100;
end

Best Answer

% Hi, I want to store the approximation for each k value that I have here in this code into an array so that I can print it out as a table.
% but I can't figure out how to do that.
% Any help appreciated.  Thank you
for k = 1:10     
    x = pi/5;      
    approximation(k) = (-1^(k-1))*((x^(2*k-1))/(2*k-1));
    prevApprox = (-1^(k-2))*((x^(2*k-2))/(2*k-2));
    true = atan(x);
    trueError = ((true - approximation(k)) / true)*100;
    approxError(k) = ((approximation(k) - prevApprox)/approximation(k))*100;
end
format long g
[(1:10).', approximation(:), approxError(:)]
ans = 10×3
                         1        -0.628318530717959                      -Inf
                         2       -0.0826834044807995         -138.732414637843
                         3        -0.019585259826258         -98.9436788648692
                         4      -0.00552282190222042         -85.6807669405445
                         5      -0.00169580653985827         -79.0493109783823
                         6     -0.000547754389827752         -75.0704374010849
                         7     -0.000182976340006646         -72.4178550162199
                         8     -6.26046751416604e-05          -70.523153312745
                         9     -2.18076486108318e-05         -69.1021270351388
                        10     -7.70307094740397e-06         -67.9968843747784
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