matlab solve [sig1,sig2] = solve('sig1^2+sig^2 = 920^2','tan(sig2/sig1) = 90*pi/180')解方程组 x^2+y^2=920^2 ; tan(y/x)=90°这个程序是能运行出来的,结果是sig1 =1/atan(1/2*pi)*(-sig2^2+846400*atan(1/2*pi)^2)^(1/2)-1/atan(1/2*pi)*(-sig2
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![matlab solve [sig1,sig2] = solve('sig1^2+sig^2 = 920^2','tan(sig2/sig1) = 90*pi/180')解方程组 x^2+y^2=920^2 ; tan(y/x)=90°这个程序是能运行出来的,结果是sig1 =1/atan(1/2*pi)*(-sig2^2+846400*atan(1/2*pi)^2)^(1/2)-1/atan(1/2*pi)*(-sig2](/uploads/image/z/2542279-31-9.jpg?t=matlab+solve+%5Bsig1%2Csig2%5D+%3D+solve%28%27sig1%5E2%2Bsig%5E2+%3D+920%5E2%27%2C%27tan%28sig2%2Fsig1%29+%3D+90%2Api%2F180%27%29%E8%A7%A3%E6%96%B9%E7%A8%8B%E7%BB%84+x%5E2%2By%5E2%3D920%5E2+%3B+tan%28y%2Fx%29%3D90%C2%B0%E8%BF%99%E4%B8%AA%E7%A8%8B%E5%BA%8F%E6%98%AF%E8%83%BD%E8%BF%90%E8%A1%8C%E5%87%BA%E6%9D%A5%E7%9A%84%2C%E7%BB%93%E6%9E%9C%E6%98%AFsig1+%3D1%2Fatan%281%2F2%2Api%29%2A%28-sig2%5E2%2B846400%2Aatan%281%2F2%2Api%29%5E2%29%5E%281%2F2%29-1%2Fatan%281%2F2%2Api%29%2A%28-sig2)
matlab solve [sig1,sig2] = solve('sig1^2+sig^2 = 920^2','tan(sig2/sig1) = 90*pi/180')解方程组 x^2+y^2=920^2 ; tan(y/x)=90°这个程序是能运行出来的,结果是sig1 =1/atan(1/2*pi)*(-sig2^2+846400*atan(1/2*pi)^2)^(1/2)-1/atan(1/2*pi)*(-sig2
matlab solve
[sig1,sig2] = solve('sig1^2+sig^2 = 920^2','tan(sig2/sig1) = 90*pi/180')
解方程组 x^2+y^2=920^2 ; tan(y/x)=90°
这个程序是能运行出来的,结果是
sig1 =
1/atan(1/2*pi)*(-sig2^2+846400*atan(1/2*pi)^2)^(1/2)
-1/atan(1/2*pi)*(-sig2^2+846400*atan(1/2*pi)^2)^(1/2)
sig2 =
sig2/atan(1/2*pi)
sig2/atan(1/2*pi)
这结果我也看不懂啊,我就像把这结果给转换成数,可用eval语句时就出问题了.
我运行的是
sig1 = eval(sig1)
sig2 = eval(sig2)
给的提示的
Error using ==> sym.mpower at 25
Matrix must be square.
Error in ==> sym.eval at 9
s = evalin('caller',map2mat(char(x)));
Error in ==> Untitled2 at 7
sig1 = eval(sig1)
.
Matrix must be square.
matlab solve [sig1,sig2] = solve('sig1^2+sig^2 = 920^2','tan(sig2/sig1) = 90*pi/180')解方程组 x^2+y^2=920^2 ; tan(y/x)=90°这个程序是能运行出来的,结果是sig1 =1/atan(1/2*pi)*(-sig2^2+846400*atan(1/2*pi)^2)^(1/2)-1/atan(1/2*pi)*(-sig2
你方程写错了.
'sig1^2+sig^2 = 920^2' 应为 'sig1^2+sig2^2 = 920^2'
>> [sig1,sig2] = solve('sig1^2+sig2^2 = 920^2','tan(sig2/sig1) = 90*pi/180')
sig1 =
920/(1+atan(1/2*pi)^2)^(1/2)
-920/(1+atan(1/2*pi)^2)^(1/2)
sig2 =
920*atan(1/2*pi)/(1+atan(1/2*pi)^2)^(1/2)
-920*atan(1/2*pi)/(1+atan(1/2*pi)^2)^(1/2)