MATLAB tutorial Jixing Yao June 22 2010 Outline Variables and Operations Variables and Operations Some Basic Matrices Plot Graphics Plot Labeling Complex Numbers Basic Operations FOR loop For loop Help Help in MATLAB Variables and Operations Matrix and Variables To create a variable x 5 y sin pi 3 z exp 3 k 1j Matrix and Variables To enter a vector A A 1 2 3 4 5 A 1 2 3 4 5 AA 1 2 3 4 5 To pick some elements of a vector AAA A 2 5 AAA A 1 3 end To check the number of elements in a vector use length length A ans 5 Matrix and Variables To enter a matrix B B 3 1 6 4 B 3 1 6 4 C A A 3 1 6 4 To check dimension of a matrix size B ans 2 2 Determinant and inverse det B ans 6 inv A ans 0 6667 0 1667 1 0000 0 5000 Basic Operations Transpose a A a 1 2 3 4 5 a A b B b 3 6 1 4 Basic Operations Addition C B b C 6 7 7 8 Subtraction D B b D 0 5 5 0 Basic Operations Multiplication Matrix Multiplication E B b E 10 22 22 52 Element wise Multiplication E B b E 9 6 6 16 Basic Operations Division Element wise Division E B b E 1 0000 0 1667 6 0000 1 0000 bB 1 F b B F 4 0000 2 5000 3 3333 1 8333 F b inv B Generating a Vector of Arithmetic Sequence v start increment end v 0 2 10 v 0 2 4 6 8 10 v 0 10 v 0 1 2 3 4 5 6 7 8 9 10 Some Basic Matrices All zero matrix z zeros 2 3 z 0 0 0 0 0 0 Matrix with ones w ones 2 3 w 111 111 Identity matrix I eye 3 I 1 0 0 0 1 0 0 0 1 Plot Graphics Plot Plot x x 1 x N y y 1 y N plot x y gives the plot with straight line connecting between the data points x 1 y 1 x N y N x 0 5 y 1 7 5 3 2 1 plot x y stem x y suitable if consider a discrete signal Subplot subplot r c p r is number of rows c is number of columns p is the position of that plot subplot 2 2 1 plot x y subplot 2 2 2 stem x y subplot 223 plot x y subplot 224 stem x y Label the Plot Title title X axis xlabel Y axis ylabel Plot Tools Complex Numbers Basic Operations Real part and imaginary part of z 1 j2 real z ans 1 imag z ans 2 Find the magnitude and the phase in radian abs z ans 2 2361 angle z ans 1 1071 Conjugate of z 1 j2 conj z ans 1 0000 2 0000i FOR Loop FOR loop FOR loop for i start increment end do P i end Example Find the summation 1 2 10 summ 0 for i 1 10 summ summ i end summ summ 55 Need Help
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