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8.1.1: Built-in MATLAB Functions of Vectors

  • Page ID
    87684
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      Many of MATLAB's built-in functions work with vectors. In fact, any built-in function that makes sense to work with vectors should work with vector inputs and/or outputs. And any built-in function that makes sense to work with matrices should work with matrix inputs and/or outputs.

      Here are some common examples of using MATLAB functions that work with vector inputs:

      x1 = 5
      x2 = 0: 2: 8 % [0 2 4 6 8]
      m2 = [1 3 5
      4 2 -1];

      %% sqrt(x)
      sqrt(x1) % 2.2361
      sqrt(x2) % 0 1.4142 2.0000 2.4495 2.8284
      sqrt(m2) % 1.00+0i 1.7321+0i 2.2361+0i
      % 2.00+0i 1.4142+0i 0.0000+1.0i

      %% rem(n,d) % remainder of n divided by d
      rem(x1,3) % 2 (remainder of 5 divided by 3)
      rem(x2,3) % 0 2 1 0 2
      rem(m2,3) % 1 0 2
      % 1 2 -1

      mod(x1,3) % 2 (remainder of 5 divided by 3)
      mod(x2,3) % 0 2 1 0 2
      mod(m2,3) % 1 0 2
      % 1 2 2

      %% size(x)
      size(x1) % 1 1 (1 row, 1 column)
      size(x2) % 1 5 (1 row, 5 columns)
      size(m2) % 2 2 (2 rows, 3 columns)
      [ncols, nrows] = size(m2)
      % ncols = 2
      % nrows = 3

      %% sin(x) in radians
      % cos(x), tan(x) work the same way
      sin(x1) % -0.9589
      sin(x2) % 0 0.9093 -0.7568 -0.2794 0.9894
      sin(m2) % 0.8415 0.1411 -0.9589
      % -0.7568 0.9093 -0.8415

      %% exp(x) = exponential of e^x, (e = 2.7183)
      exp(x1) % 148.4132
      exp(x2) % 0.0010 0.0074 0.0546 0.4034 2.9810
      exp(m2) % 2.7183 20.0855 148.4132
      % 54.5982 7.3891 0.3679

      %% log(x) = the natural logarithm (base e)
      % In math and physics, this is called ln(x)
      % But log(x) = the natural logarithm has been traditional
      % in many computer programming languages since the 1960s
      log(x1) % 1.6094
      log(x2) % -Inf 0.6931 1.3863 1.7918 2.0794
      log(m2) % 0+0i 1.098+0i 1.609+0i
      % 1.38+0i 0.693+0i 0.000+3.1416i
      % In Matlab, the log base 10 function is log10():
      log10(x2) % -Inf 0.3010 0.6021 0.7782 0.9031

      %% You can also nest functions, as shown here.
      sin(sqrt(0.5)) % 0.6496 MATLAB fist computes sqrt(0.5), then computes the sin() of that result.

      .


      This page titled 8.1.1: Built-in MATLAB Functions of Vectors is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by Carey Smith.

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