How to average certain columns in a matrix

I have a 107x16 matrix, the first column is time data, the last 15 are data points. I'd like to average the 15 data columns and collapse this matrix into a 107x2 matrix of time and average data.

Thank you!

Answer 1

[madhan ravi]

matrix = rand(107, 16);
Matrix = [matrix(:, 1), mean(matrix(:, 2 : end), 2)];
size(Matrix)

ans = 1×2

107 2

Answer 2

[madhan ravi]

T = array2table(rand(2, 3))

T = 2×3 table
     Var1       Var2       Var3  
    _______    _______    _______

     0.8811    0.32473    0.53106
    0.63365    0.29403    0.93199

T = [T(:, 1), array2table(mean(T{:, 2 : end}, 2), 'V', {'AVERAGE'})] % where Var1 is the time data

T = 2×2 table
     Var1      AVERAGE
    _______    _______

     0.8811     0.4279
    0.63365    0.61301