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Lab 2: ＭＡＴＬＡＢ之基本繪圖功能

Lab 2: ＭＡＴＬＡＢ之基本繪圖功能. 二維Ｘ－Ｙ座標圖. plot、 plot(x)、plot(x,y)、plot(x,y,’ ‘) loglog、semilogx、semilogy, logspace x=[1:1:5]; y=[1,4,9,16,25]; plot(x,y,’r+’);grid loglog(x,y);grid polar(Θ,ρ) x=0:(pi/18):(2*pi); y=1+cos(x); polar(x,y);. plot相關參數及繪圖視窗應用. whitebg～for MATLAB 4.x graphic window

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Lab 2: ＭＡＴＬＡＢ之基本繪圖功能

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  1. Lab 2:ＭＡＴＬＡＢ之基本繪圖功能

  2. 二維Ｘ－Ｙ座標圖 • plot、 plot(x)、plot(x,y)、plot(x,y,’ ‘) • loglog、semilogx、semilogy, logspace • x=[1:1:5]; • y=[1,4,9,16,25]; • plot(x,y,’r+’);grid • loglog(x,y);grid • polar(Θ,ρ) • x=0:(pi/18):(2*pi); • y=1+cos(x); • polar(x,y);

  3. plot相關參數及繪圖視窗應用 • whitebg～for MATLAB 4.x • graphic window • 4.2～EditCopy Options • 5.0～FilePreferencesCopying Options • 顏色、形式 • y(黃)、m(洋紅)、c(青)、r(紅) • g(綠)、b(藍)、w(白)、k(黑) • .、o、x、+、* • -(實線)、:(點線)、-.(長點線)、--(虛線)

  4. 標題說明 • title(‘string’) • title(‘This plot is a test!’); • xlabel(‘string’)、ylabel(‘string’) • xlabel(‘time(second)’); • ylabel(‘height(meter)’); • text(x0,y0,’string’)、gtext(‘string’) • text(2,4,‘It is here’); • gtext(‘use your mouse to put the text!’); • grid

  5. 圖形顯示控制 • axis • axis([Xmin Xmax Ymin Ymax])、axis(‘normal‘)、axis(‘square’) • 輪流設定為設定範圍或自動調整 • hold • hold、hold on、hold off • shg、clg • subplot(mnp)

  6. ＭＡＴＬＡＢ程式撰寫入門

  7. .M file 簡介及其他 • 變數名稱=起始值:遞增值:終止值 • 函式 M file • function、macro • %～註解 • 流程控制 • for end • while、if，elself，else • break，pause，return

  8. delt_ang=pi/18; start_ang=0; end_ang=2*pi; offset=2.0; i=0 for ang=start_ang:delt_ang:end_ang, i=i+1; xrad(i)=ang; x(i)=ang*180./pi; y(i)=offset+cos(ang); end plot(x,y); grid; pause; loglog(x,y); grid; pause; polar(xrad,y);

  9. 練習作業 仿照前一頁程式，寫一matlab程式，劃出函數 其中 從 0 度到 360 度

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