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#mermaid-svg-v5vF1C7wlqNj8FNh .label{font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family);fill:#333;color:#333}#mermaid-svg-v5vF1C7wlqNj8FNh .label text{fill:#333}#mermaid-svg-v5vF1C7wlqNj8FNh .node rect,#mermaid-svg-v5vF1C7wlqNj8FNh .node circle,#mermaid-svg-v5vF1C7wlqNj8FNh .node ellipse,#mermaid-svg-v5vF1C7wlqNj8FNh .node polygon,#mermaid-svg-v5vF1C7wlqNj8FNh .node path{fill:#ECECFF;stroke:#9370db;stroke-width:1px}#mermaid-svg-v5vF1C7wlqNj8FNh .node .label{text-align:center;fill:#333}#mermaid-svg-v5vF1C7wlqNj8FNh .node.clickable{cursor:pointer}#mermaid-svg-v5vF1C7wlqNj8FNh .arrowheadPath{fill:#333}#mermaid-svg-v5vF1C7wlqNj8FNh .edgePath .path{stroke:#333;stroke-width:1.5px}#mermaid-svg-v5vF1C7wlqNj8FNh .flowchart-link{stroke:#333;fill:none}#mermaid-svg-v5vF1C7wlqNj8FNh .edgeLabel{background-color:#e8e8e8;text-align:center}#mermaid-svg-v5vF1C7wlqNj8FNh .edgeLabel rect{opacity:0.9}#mermaid-svg-v5vF1C7wlqNj8FNh .edgeLabel 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path{stroke-width:0}#mermaid-svg-v5vF1C7wlqNj8FNh .today{fill:none;stroke:red;stroke-width:2px}#mermaid-svg-v5vF1C7wlqNj8FNh .task{stroke-width:2}#mermaid-svg-v5vF1C7wlqNj8FNh .taskText{text-anchor:middle;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-v5vF1C7wlqNj8FNh .taskText:not([font-size]){font-size:11px}#mermaid-svg-v5vF1C7wlqNj8FNh .taskTextOutsideRight{fill:#000;text-anchor:start;font-size:11px;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-v5vF1C7wlqNj8FNh .taskTextOutsideLeft{fill:#000;text-anchor:end;font-size:11px}#mermaid-svg-v5vF1C7wlqNj8FNh .task.clickable{cursor:pointer}#mermaid-svg-v5vF1C7wlqNj8FNh .taskText.clickable{cursor:pointer;fill:#003163 !important;font-weight:bold}#mermaid-svg-v5vF1C7wlqNj8FNh .taskTextOutsideLeft.clickable{cursor:pointer;fill:#003163 !important;font-weight:bold}#mermaid-svg-v5vF1C7wlqNj8FNh 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.activeText3{fill:#000 !important}#mermaid-svg-v5vF1C7wlqNj8FNh .done0,#mermaid-svg-v5vF1C7wlqNj8FNh .done1,#mermaid-svg-v5vF1C7wlqNj8FNh .done2,#mermaid-svg-v5vF1C7wlqNj8FNh .done3{stroke:grey;fill:#d3d3d3;stroke-width:2}#mermaid-svg-v5vF1C7wlqNj8FNh .doneText0,#mermaid-svg-v5vF1C7wlqNj8FNh .doneText1,#mermaid-svg-v5vF1C7wlqNj8FNh .doneText2,#mermaid-svg-v5vF1C7wlqNj8FNh .doneText3{fill:#000 !important}#mermaid-svg-v5vF1C7wlqNj8FNh .crit0,#mermaid-svg-v5vF1C7wlqNj8FNh .crit1,#mermaid-svg-v5vF1C7wlqNj8FNh .crit2,#mermaid-svg-v5vF1C7wlqNj8FNh .crit3{stroke:#f88;fill:red;stroke-width:2}#mermaid-svg-v5vF1C7wlqNj8FNh .activeCrit0,#mermaid-svg-v5vF1C7wlqNj8FNh .activeCrit1,#mermaid-svg-v5vF1C7wlqNj8FNh .activeCrit2,#mermaid-svg-v5vF1C7wlqNj8FNh .activeCrit3{stroke:#f88;fill:#bfc7ff;stroke-width:2}#mermaid-svg-v5vF1C7wlqNj8FNh .doneCrit0,#mermaid-svg-v5vF1C7wlqNj8FNh .doneCrit1,#mermaid-svg-v5vF1C7wlqNj8FNh .doneCrit2,#mermaid-svg-v5vF1C7wlqNj8FNh .doneCrit3{stroke:#f88;fill:#d3d3d3;stroke-width:2;cursor:pointer;shape-rendering:crispEdges}#mermaid-svg-v5vF1C7wlqNj8FNh .milestone{transform:rotate(45deg) scale(0.8, 0.8)}#mermaid-svg-v5vF1C7wlqNj8FNh .milestoneText{font-style:italic}#mermaid-svg-v5vF1C7wlqNj8FNh .doneCritText0,#mermaid-svg-v5vF1C7wlqNj8FNh .doneCritText1,#mermaid-svg-v5vF1C7wlqNj8FNh .doneCritText2,#mermaid-svg-v5vF1C7wlqNj8FNh .doneCritText3{fill:#000 !important}#mermaid-svg-v5vF1C7wlqNj8FNh .activeCritText0,#mermaid-svg-v5vF1C7wlqNj8FNh .activeCritText1,#mermaid-svg-v5vF1C7wlqNj8FNh .activeCritText2,#mermaid-svg-v5vF1C7wlqNj8FNh .activeCritText3{fill:#000 !important}#mermaid-svg-v5vF1C7wlqNj8FNh .titleText{text-anchor:middle;font-size:18px;fill:#000;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-v5vF1C7wlqNj8FNh g.classGroup text{fill:#9370db;stroke:none;font-family:'trebuchet ms', verdana, 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text{fill:#9370db;stroke:none;font-size:10px;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-v5vF1C7wlqNj8FNh g.stateGroup text{fill:#9370db;fill:#333;stroke:none;font-size:10px}#mermaid-svg-v5vF1C7wlqNj8FNh g.statediagram-cluster .cluster-label text{fill:#333}#mermaid-svg-v5vF1C7wlqNj8FNh g.stateGroup .state-title{font-weight:bolder;fill:#000}#mermaid-svg-v5vF1C7wlqNj8FNh g.stateGroup rect{fill:#ECECFF;stroke:#9370db}#mermaid-svg-v5vF1C7wlqNj8FNh g.stateGroup line{stroke:#9370db;stroke-width:1}#mermaid-svg-v5vF1C7wlqNj8FNh .transition{stroke:#9370db;stroke-width:1;fill:none}#mermaid-svg-v5vF1C7wlqNj8FNh .stateGroup .composit{fill:white;border-bottom:1px}#mermaid-svg-v5vF1C7wlqNj8FNh .stateGroup .alt-composit{fill:#e0e0e0;border-bottom:1px}#mermaid-svg-v5vF1C7wlqNj8FNh .state-note{stroke:#aa3;fill:#fff5ad}#mermaid-svg-v5vF1C7wlqNj8FNh .state-note text{fill:black;stroke:none;font-size:10px}#mermaid-svg-v5vF1C7wlqNj8FNh .stateLabel .box{stroke:none;stroke-width:0;fill:#ECECFF;opacity:0.7}#mermaid-svg-v5vF1C7wlqNj8FNh .edgeLabel text{fill:#333}#mermaid-svg-v5vF1C7wlqNj8FNh .stateLabel text{fill:#000;font-size:10px;font-weight:bold;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-v5vF1C7wlqNj8FNh .node circle.state-start{fill:black;stroke:black}#mermaid-svg-v5vF1C7wlqNj8FNh .node circle.state-end{fill:black;stroke:white;stroke-width:1.5}#mermaid-svg-v5vF1C7wlqNj8FNh #statediagram-barbEnd{fill:#9370db}#mermaid-svg-v5vF1C7wlqNj8FNh .statediagram-cluster rect{fill:#ECECFF;stroke:#9370db;stroke-width:1px}#mermaid-svg-v5vF1C7wlqNj8FNh .statediagram-cluster rect.outer{rx:5px;ry:5px}#mermaid-svg-v5vF1C7wlqNj8FNh .statediagram-state .divider{stroke:#9370db}#mermaid-svg-v5vF1C7wlqNj8FNh .statediagram-state .title-state{rx:5px;ry:5px}#mermaid-svg-v5vF1C7wlqNj8FNh .statediagram-cluster.statediagram-cluster .inner{fill:white}#mermaid-svg-v5vF1C7wlqNj8FNh .statediagram-cluster.statediagram-cluster-alt .inner{fill:#e0e0e0}#mermaid-svg-v5vF1C7wlqNj8FNh .statediagram-cluster .inner{rx:0;ry:0}#mermaid-svg-v5vF1C7wlqNj8FNh .statediagram-state rect.basic{rx:5px;ry:5px}#mermaid-svg-v5vF1C7wlqNj8FNh .statediagram-state rect.divider{stroke-dasharray:10,10;fill:#efefef}#mermaid-svg-v5vF1C7wlqNj8FNh .note-edge{stroke-dasharray:5}#mermaid-svg-v5vF1C7wlqNj8FNh .statediagram-note rect{fill:#fff5ad;stroke:#aa3;stroke-width:1px;rx:0;ry:0}:root{--mermaid-font-family: '"trebuchet ms", verdana, arial';--mermaid-font-family: "Comic Sans MS", "Comic Sans", cursive}#mermaid-svg-v5vF1C7wlqNj8FNh .error-icon{fill:#522}#mermaid-svg-v5vF1C7wlqNj8FNh .error-text{fill:#522;stroke:#522}#mermaid-svg-v5vF1C7wlqNj8FNh .edge-thickness-normal{stroke-width:2px}#mermaid-svg-v5vF1C7wlqNj8FNh .edge-thickness-thick{stroke-width:3.5px}#mermaid-svg-v5vF1C7wlqNj8FNh .edge-pattern-solid{stroke-dasharray:0}#mermaid-svg-v5vF1C7wlqNj8FNh .edge-pattern-dashed{stroke-dasharray:3}#mermaid-svg-v5vF1C7wlqNj8FNh .edge-pattern-dotted{stroke-dasharray:2}#mermaid-svg-v5vF1C7wlqNj8FNh .marker{fill:#333}#mermaid-svg-v5vF1C7wlqNj8FNh .marker.cross{stroke:#333}:root { --mermaid-font-family: "trebuchet ms", verdana, arial;}#mermaid-svg-v5vF1C7wlqNj8FNh {color: rgba(0, 0, 0, 0.75);font: ;}

import turtle as tt
from random import randinttt.TurtleScreen._RUNNING = True
tt.speed(0)
tt.bgcolor('black')
tt.setpos(-25, 25)
tt.colormode(255)
cnt = 0
while cnt  < 500:r = randint(0, 255)g = randint(0, 255)b = randint(0, 255)tt.pencolor(r, g, b)tt.forward(50 + cnt)tt.right(91)cnt += 1
tt.done()`

clear
format rat
[m,n]=size(A);
for i=1:(m-1)numb=int2str(i);disp(['第',numb,'次选列主元后的增广矩阵'])for j=(i+1):mA(j,:)=A(j,:)-A(i,:)*A(j,i)/A(i,i);endA
end
%回代过程
disp('回代求解')
x(m)=A(m,n)/A(m,m);
for i=(m-1):-1:1x(i)=(A(i,n)-A(i,i+1:m)*x(i+1:m)')/A(i,i);
end
xx=huidai(a);