Merge branch 'master' of https://github.com/angeloyeo/gongdols

MATLAB강의/debugging/case1_no_additional_functions/main.m

@@ -0,0 +1,14 @@
+clear; close all; clc;
+
+disp('Hello there!');
+
+a = 1;
+b = 2;
+
+c = a * b + 3;
+
+for i = 1:5
+    disp(['Hi. The iteration number is: ',num2str(i)]);
+end
+
+disp(c)

MATLAB강의/debugging/case2_with_function_inside/main.m

@@ -0,0 +1,20 @@
+clear; close all; clc;
+
+disp('Hello there!');
+
+a = 1;
+b = 2;
+
+cc = my_addition(a, b);
+
+
+for i = 1:5
+    disp(['Hi. The iteration number is: ',num2str(i)]);
+end
+
+disp(cc)
+
+function  c = my_addition(a, b)
+
+c = a + b;
+end

MATLAB강의/debugging/case3_with_functions_outside/main.m

@@ -0,0 +1,24 @@
+clear; close all; clc;
+
+disp('Hello there!');
+
+a = 1;
+b = 2;
+
+cc = my_addition(a, b);
+
+for i = 1:5
+    disp(['Hi. The iteration number is: ',num2str(i)]);
+end
+
+ii=1;
+while(1)
+    disp('aaaa');
+    if ii == 5
+        break;
+    end
+    ii=ii+1;
+end
+
+disp(cc)
+

MATLAB강의/debugging/case3_with_functions_outside/my_addition.m

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+function  c = my_addition(a, b)
+
+c = a + b;
+end

고려대학교zoom강의/210524lecture/fun_plotComplexPlane.m

@@ -0,0 +1,36 @@
+function fun_plotComplexPlane(x1,x2,y1,y2,h_newfig)
+
+if h_newfig
+    figure;
+    set(gcf,'position',[500,100,1000,650])
+    set(gcf,'color','w');
+end
+set(gca,'visible','off')
+mArrow2(x1,0,x2,0,{'color','k'});
+mArrow2(0,y1,0,y2,{'color','k'});
+xlim([x1 x2])
+ylim([y1 y2])
+
+for i = (x1+1):(x2-1)
+    line([i i],[-0.05 0.05],'color','k')
+    line([-0.05 0.05],[i i],'color','k')
+    if i<=0
+        t= text(i-0.2, -0.3,num2str(i));
+    else
+        t= text(i-0.05, -0.3,num2str(i));
+    end
+    t.FontSize=15;
+
+    if i<0
+        t = text(-0.4, i,num2str(i));
+    elseif i>0
+        t = text(-0.3, i,num2str(i));
+    end
+    t.FontSize = 15;
+end
+
+t = text(x2*0.9,0.3,'Real axis');
+t.FontSize = 15;
+t = text(0.2,y2*0.9,'Imaginary axis');
+t.FontSize = 15;
+axis square

고려대학교zoom강의/210524lecture/fun_plotNumberLine.m

@@ -0,0 +1,17 @@
+function fun_plotNumberLine(x1,x2,h_newfig)
+
+if h_newfig
+    figure;
+    set(gcf,'position',[500,100,1000,650])
+    set(gcf,'color','w');
+end
+set(gca,'visible','off')
+mArrow2(x1-1,0,x2+1,0,{'color','k'});
+xlim([x1-1 x2+1])
+ylim([-1 1])
+
+for i = x1:x2
+    line([i i],[-0.025 0.025],'color','k')
+    t= text(i-0.1, -0.1,num2str(i));
+    t.FontSize=15;
+end

고려대학교zoom강의/210524lecture/mArrow2.m

@@ -0,0 +1,9 @@
+
+function [ h ] = mArrow2(x1,y1,x2,y2,props)
+
+h = annotation('arrow');
+set(h,'parent', gca, ...
+    'position', [x1,y1,x2-x1,y2-y1], ...
+    'HeadLength', 10, 'HeadWidth', 10, 'HeadStyle', 'cback1', ...
+    props{:});
+end

고려대학교zoom강의/210524lecture/pics.m

@@ -0,0 +1,138 @@
+clear; close all; clc;
+
+%% 3을 수직선 상에 표현해주는 그림
+
+clear v
+v = VideoWriter('fig1.mp4','MPEG-4');
+v.FrameRate = 50;
+v.Quality = 100;
+open(v);
+
+clear F
+
+fun_plotNumberLine(-4,4,true)
+hold on;
+the_num = 3;
+n_step = 50;
+for i_step = 1:n_step
+
+
+    len_arrows = linspace(1, the_num, n_step);
+    len_arrow = len_arrows(i_step);
+
+    h = mArrow2(0,0,len_arrow,0,{'color','r','linewidth',3});
+    F(i_step)=getframe(gcf);
+
+    drawnow;
+    if i_step < n_step
+        delete(h)
+    end
+end
+
+
+for i=1:length(F)
+    % convert the image to a frame
+    frame = F(i) ;
+    writeVideo(v, frame);
+end
+
+close(v)
+
+
+%% -3을 수직선 상에 표현해주는 그림
+
+clear v
+v = VideoWriter('fig2.mp4','MPEG-4');
+v.FrameRate = 50;
+v.Quality = 100;
+open(v);
+
+clear F
+
+fun_plotNumberLine(-4,4,true)
+hold on;
+the_num = -3;
+n_step = 50;
+for i_step = 1:n_step
+
+
+    len_arrows = linspace(1, the_num, n_step);
+    len_arrow = len_arrows(i_step);
+
+    h = mArrow2(0,0,len_arrow,0,{'color','r','linewidth',3});
+    F(i_step)=getframe(gcf);
+
+    drawnow;
+    if i_step < n_step
+        delete(h)
+    end
+end
+
+
+for i=1:length(F)
+    % convert the image to a frame
+    frame = F(i) ;
+    writeVideo(v, frame);
+end
+
+close(v)
+
+%% 3x3을 수직선 상에 표현해주는 그림
+
+clear v
+v = VideoWriter('fig3.mp4','MPEG-4');
+v.FrameRate = 50;
+v.Quality = 100;
+open(v);
+
+clear F
+
+fun_plotNumberLine(-4,10,true)
+hold on;
+the_num = 3;
+n_step = 50;
+for i_step = 1:n_step
+
+
+    len_arrows = linspace(1, the_num, n_step);
+    len_arrow = len_arrows(i_step);
+
+    h = mArrow2(0,0,len_arrow,0,{'color','r','linewidth',3});
+    F(i_step)=getframe(gcf);
+
+    drawnow;
+    if i_step < n_step
+        delete(h)
+    end
+end
+
+for i = 1:10
+    F(end+1) = getframe(gcf);
+end
+
+delete(h)
+
+for i_step = 1:n_step
+
+
+    len_arrows = linspace(the_num, the_num^2, n_step);
+    len_arrow = len_arrows(i_step);
+
+    h = mArrow2(0,0,len_arrow,0,{'color','r','linewidth',3});
+    F(end+1)=getframe(gcf);
+
+    drawnow;
+    if i_step < n_step
+        delete(h)
+    end
+end
+
+
+for i=1:length(F)
+    % convert the image to a frame
+    frame = F(i) ;
+    writeVideo(v, frame);
+end
+
+close(v)
+

고려대학교zoom강의/calculus.m

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+clear; close all; clc;
+
+
+%% Fig 3. 한 점 (x,y)에서 순간 변화율과 평균 변화율 (동영상)
+for x1 = [1, 0.5, 0.1]+1
+    plotXY(-1,3,-1,3,true,20)
+    x = linspace(-1,3, 100);
+    y = 1/3*x.^2 + 1;
+    hold on;
+    plot(x,y,'k','linewidth',2)
+
+    x = linspace(-0.5, 2.5, 100);
+
+    plot(x, 2/3*x + 2/3,'b','linewidth',3)
+    plot(1, 4/3 ,'o','markerfacecolor','b','markeredgecolor','none','markersize',10)
+
+    y1 = 1/3 * x1^2  + 1;
+
+    y = (y1-4/3)/(x1-1) * (x-1) + 4/3;
+    h(1) = plot(x1, y1, 'o', 'markerfacecolor','r','markeredgecolor','none','markersize',10);
+    h(2) = plot(x, y, 'r','linewidth',3);
+
+end
+
+
+%% Fig 3. 한 점 (x,y)에서 순간 변화율과 평균 변화율 (동영상)
+clear v
+v = VideoWriter('fig3.mp4','MPEG-4');
+v.FrameRate = 30;
+v.Quality = 100;
+open(v);
+
+clear F
+
+plotXY(-1,3,-1,3,true,20)
+x = linspace(-1,3, 100);
+y = 1/3*x.^2 + 1;
+hold on;
+plot(x,y,'k','linewidth',2)
+
+x = linspace(-0.5, 2.5, 100);
+
+plot(x, 2/3*x + 2/3,'b','linewidth',3)
+plot(1, 4/3 ,'o','markerfacecolor','b','markeredgecolor','none','markersize',10)
+
+i=1;
+for x1 = linspace(3,1,100)
+
+
+    y1 = 1/3 * x1^2  + 1;
+
+    y = (y1-4/3)/(x1-1) * (x-1) + 4/3;
+    h(1) = plot(x1, y1, 'o', 'markerfacecolor','r','markeredgecolor','none','markersize',10);
+    h(2) = plot(x, y, 'r','linewidth',3);
+    drawnow;
+
+    F(i)=getframe(gcf);
+    if x1>1
+        delete(h)
+    end
+    i=i+1;
+end
+
+
+for i=1:length(F)
+    % convert the image to a frame
+    frame = F(i) ;
+    writeVideo(v, frame);
+end
+
+close(v)
+
+%% 3d plot
+
+close all;
+[X,Y] = meshgrid(linspace(-3,3,20));
+
+surf(X, Y, -X.^2-Y.^2+1)
+xlabel('$$x$$','interpreter','latex'); ylabel('$$y$$','interpreter','latex'); zlabel('$$z=-x^2-y^2+1$$','interpreter','latex');
+hold on;
+xx = -1 * ones(1,100);
+yy = linspace(-3,3,100);
+zz = -xx.^2 - yy.^2  + 1;
+plot3(xx,yy,zz,'r','linewidth',3)
+
+% tangential line
+% (-1, -1, -1)에서...?
+% round z round y = - 2y
+t = linspace(-0.5,1,100);
+
+x = -1 * ones(1, 100);
+y = -2 + 4 * t;
+z = -4 + 16*t
+
+plot3(x,y,z,'k','linewidth',3);
+plot3(-1,-2,-4,'o','markersize',7,'markerfacecolor','k','markeredgecolor','none')
+
+axis square
+

고려대학교zoom강의/intro_plots.m

@@ -0,0 +1,27 @@
+clear; close all; clc;
+
+%%
+
+x1 = randn(1, 100) * 4 + 10;
+x2 = randn(1, 100) * 4 + 25;
+
+x1(x1<0) = abs(x1(x1<0));
+x2(x2<0) = abs(x2(x2<0));
+rng(1)
+figure('position',[1000, 650, 700, 350]);
+histogram(x1);
+hold on;
+histogram(x2);
+xlabel('귀의 길이(cm)');
+ylabel('count');
+title('고양이와 강아지의 귀의 길이를 통한 구별');
+grid on;
+
+figure;
+
+plot(x1, 0,'o','markerfacecolor','b','markeredgecolor','none');
+hold on;
+plot(x2,0,'o','markerfacecolor','r','markeredgecolor','none');
+
+xlabel('귀의 길이(cm)');
+title('귀의 길이 데이터를 1차원 벡터 공간 상에 매핑');