南邮数学实验答案

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1、精品文档，仅供学习与交流，如有侵权请联系网站删除第一次练习题1、求的所有根。>>x=-5:0.01:5;y=exp(x)-3x.^2;plot(x,y);gridon>>fsolve('exp(x)-3x.^2',-1)Equationsolved.fsolvecompletedbecausethevectoroffunctionvaluesisnearzeroasmeasuredbythedefaultvalueofthefunctiontolerance,andtheproblemappearsregulara

2、smeasuredbythegradient.ans=-0.4590>>fsolve('exp(x)-3x.^2',1)Equationsolved.fsolvecompletedbecausethevectoroffunctionvaluesisnearzeroasmeasuredbythedefaultvalueofthefunctiontolerance,andtheproblemappearsregularasmeasuredbythegradient.

3、toppingcriteriadetails>ans=0.9100>>fsolve('exp(x)-3x.^2',4)Equationsolved.fsolvecompletedbecausethevectoroffunctionvaluesisnearzeroasmeasuredbythedefaultvalueofthefunctiontolerance,andtheproblemappearsregularasmeasuredbythegradient.ans

4、=3.73312、求下列方程的根。1)2）3）1)>>p=[1,0,0,0,5,1];r=roots(p)r=1.1045+1.0598i1.1045-1.0598i-1.0045+1.0609i-1.0045-1.0609i-0.19992)>>x=-10:0.01:10;y=x.sin(x)-1/2;plot(x,y);gridon>>fsolve('x.sin(x)-1/2',-6)Equationsolved.【精品文档】第17页精品文档，仅供学习与交流，如有侵权请联系网站删除fsolvecompleted

5、becausethevectoroffunctionvaluesisnearzeroasmeasuredbythedefaultvalueofthefunctiontolerance,andtheproblemappearsregularasmeasuredbythegradient.ans=-6.3619>>fsolve('x.sin(x)-1/2',-4)Equationsolved.fsolvecompletedbecausethevectoroffuncti

6、onvaluesisnearzeroasmeasuredbythedefaultvalueofthefunctiontolerance,andtheproblemappearsregularasmeasuredbythegradient.ans=-2.9726>>fsolve('x.sin(x)-1/2',2)Equationsolved.fsolvecompletedbecausethevectoroffunctionvaluesisnearzeroasmeasu

7、redbythedefaultvalueofthefunctiontolerance,andtheproblemappearsregularasmeasuredbythegradient.ans=0.74083)>>x=-3:0.01:3;y=sin(x).cos(x)-x.^2;plot(x,y);gridon>>fsolve('sin(x).cos(x)-x.^2',-1)Equationsolved.fsolvecompletedbecausethevecto

8、roffunctionvaluesisnearzeroasmeasuredbythedefaultvalueofthefunctiontolerance,andtheproblemappearsregularasmeasuredbythegradient.ans=-6.8434e-010>>fsolve('s