Lesson 3 - 2D plot, Labels,colour, Subplot, Bar, histo , polar, semilog, loglog, 3D Mesh Surfaces

Lesson 3 Plots Using Octave / Metlab 2D: (X,y) plot, Graph Labels, Plot - colour, marker, style, Subplot() function, Bar, histogram , polar graphs, Semilogx(), semilogy(), loglog(),3D Mesh Surfaces X,y) plot - 2d Graph – Plot statement - Need to define the x-axis AND y-axis Graph Labels Grid on (add grid lines) Title (‘text’) xlabel (‘x-axis’) ylabel (‘y-label’) legend ( ) Plot - colour, marker, style Colour: b – blue g – green k – black r - red Marker: + vertical cross * star o circle x diagonal cross Line Style: - solid line . dotted ^ impulses L Steps .+r would plot a dotted, cross, red line Example 1: X = [0:0.1:10] Y = sin(x) plot (x,y) title ( ‘y=sin(x)’ ) Grid on Example 2: Plot a straight line [x1,y1] = [0 6] [x2,y2] = [2 6] Plot on octave Plot ([0 2], [6 6]) Example 3: Multiple plot x = 0:0.1:10 y1 = sin(x) y2 = cos(x) plot (x,y1, ‘.+r’, x,y2, ‘-*b’) title (‘y1 and y2’) grid on Subplot() function You can create subplots within a single plot windows. Subplot (Row, Column, position) Example 4: sub plot x = 0:0.1:10 y1 = sin(x) y2 = cos(x) y3 = tan(x) Subplot(2,2,1), plot(x,y1) Subplot(2,2,2), plot(x,y2) Subplot(2,2,3), plot(x,y3) Bar, histogram , polar graphs Example 5: Bar Charts X = [2 4 6 8 10] Y = [1.2 2.5 3.0 1.6 1.1] Bar (x,y) Example 6: Barh Charts X = [2 4 6 8 10] Y = [1.2 2.5 3.0 1.6 1.1] Barh (x,y) Example 7: Histogram Charts Semilogx(), semilogy(), loglog() Example 9: semilogx – plot with logarithmically spaced x-axes Y= [0:1:5] X=exp(-y/1) semilogx(x,y) grid on Example 10: semilogy – plot with logarithmically spaced y-axes X = [0:1:5] Y =exp(-x/1) Semilogy(x,y) Grid on Example 11: subplot loglog graph1 X1 = [0:1:5] Y1 =exp(-x/1) subplot(2,1,1) Semilogy(x,y) Grid on graph2 x2 = [0:1:5] y2 = exp(x2/2) subplot (2,1,2) loglog(x2,y2) grid on Mesh Surfaces *Mesh() – octave plots a wireframe mesh using *rectangle mesh x,y,z) *Meshgrid() – is used to produce input for a 2D or 3D function that will be plotted Linspace: Create a row vector of N elements evenly spaced between x1 and x2 *Surf() generates a 3D surface plot whereby a wire mesh surface is filled up with small tiles *Meshc: generates a 3D rectangular mesh, including contour plot. Example 1: Mesh() x=y=linspace (-1,1,15) [x,y] = meshgrid(x,y) z = x^2 + y^2 mesh (x,y,z) xlabel(‘x-axis’), y-label(‘y-axis’), zlabel(‘z-axis’) Example 2: Meshgrid() x=y=linspace(-1,1,5) x=y=meshgrid(x,y) z = (x^2 – y^2) mesh (x,y,z) Example 3: Surf x=y=linspace(-1,1,5) x=y=meshgrid(x,y) z = (x^2 – y^2) surf (x,y,z) Example 4: meshc x=y=linspace(-1,1,5) x=y=meshgrid(x,y) z = (x^2 – y^2) meshc (x,y,z) -------------------------------------------------------------------------------------------------- Access Ready Information for you: Octave, Coco Simulation, DWSIM Simulation Octave: 1. Download Octave -    • How To Download and Install Octave GN...   2. Lesson 1.1 - Octave Tutorial / Matlab Introduction to Octave    • Lesson 1.1 - Octave Tutorial / Matlab...   3. Lesson 1.2 - OCTAVE TUTORIAL (MATLAB): HELP FUNCTION, DISP FUNCTION, INPUT FUNCTION. link:    • LESSON 1.2 – OCTAVE TUTORIAL (MATLAB)...   4. 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Lesson 4.1    • Example: Control Statments, For Loop,...   DWSIM Simulation 1.    • How to Download and Install DWSIM V6....   -------------------------------------------------------------------------------------------- Email any example you'd like for me to solve something similar of [email protected] Or comment your questions Thanks for watching next tricky problems / lessons that will broaden your knowledge are coming --------------------------------------------------------------------------------------------------------------------------