Z=exp(-(X.^2+Y.^2)/2^2);中exp的意义和作用是什么?

Z=exp(-(X.^2+Y.^2)/2^2);中exp的意义和作用是什么? 下面的MATLAB程序哪里错了,怎么出来都是一条直线呀?x=0.5:0.02:1.3;z=0.6*x./(1-2*x);y=(0.6*x.*(exp(-5*z))/(1-exp(-3*z))-x+0.6*x.*exp(-2*z)-0.6*x.*exp(-5*z))/z;plot(x,y) matlab 用solve或者fsolve求解方程组clcsyms x y z;eq1 =-(31*x*exp(29301/2500 - (31*x^2)/(10000*z) - y^2/(10000*z) - (661*z)/625))/(5000*z);eq2 =-(y*exp(29301/2500 - (31*x^2)/(10000*z) - y^2/(10000*z) - (661*z)/625))/(5000*z);eq3=exp(29301/2500 对函数绘图Z=y*exp(x^2-y^2) matlab中z=x.*exp(-0.5*x.^2-Y.^3) z =-4*cos(2*exp(-x))*exp(-x)^2-2*sin(2*exp(-x))*exp(-x)要将x=3代入,怎样通过matlab软件实现? 求助用matlab画出一个函数的等高线f(x1,x2)=exp(x1+3*x2-0.1) + exp(x1-3*x2-0.1) + exp(-x1 - 0.1)我的程序是这样的：[X,Y] = meshgrid((-10:1:10),(-10:1:10));Z = exp(X+3.*Y-0.1)+exp(X-3.*Y-0.1)+exp(-X-0.1);%Z = X.*exp(-X.^2-Y.^2);[C,h] 设z=z(x,y)有下列方程确定：z=exp(2x-3z)+2y 求3δz/δx+δz/δy f(x,y)=exp(-(x+y)) x>0 y>0 求Z=(X+Y)/2的概率密度.f(x,y)=exp(-(x+y)) x>0 y>0 求Z=(X+Y)/2的概率密度.答案是4zexp(-2z）,z>00.其他 f(x,y)=exp(-(x+y)) x>0 y>0 求Z=(X+Y)/2的概率密度.为什么其密度不等于∫f(x,2z-x)dx?（上下线是2z 0） matlab 中Z = X.*exp(-X.^2 - Y.^2);具体意思?具体代码：[X,Y] = meshgrid(-2:.2:2); Z = X.*exp(-X.^2 - Y.^2); [DX,DY] = gradient(Z,.2,.2); contour(X,Y,Z); %等高线figure,quiver(X,Y,DX,DY); 求三元函数matlab作图代码刚接触matlab,对于三元函数的曲面图有点无从下手……函数如下：C(x,y,z)=((50(1+0.0001x)^0.5)/(0.0484*pi*x^2))*exp(-(y^2)*(1+0.0001x))/(0.0968x^2))*{exp(-(z-80)^2/(0.0968x^2))+exp(-(z+80)^2/(0.096 matlab绘制指数函数图像f(x,y)=xe^-(x^2+y^2)matlab程序：x=-5:0.1:5;y=-5:0.1:5;z=x*exp(-(x.^2+y.^2));plot3(x,y,z)哪里错了? 用matlab ,画z=0.0008*(x+1+2*exp(-(n*pi/x).^2*y*1000))/x区间：x（0,1）;y（0,1）n是对exp（）的内容,1到无穷求和 如何用matlab解非线性方程组,求写成程序,万分感激!E1=-1/2/(betainc(1-y/x,1.5,y+1)+(y/x).^y*exp(x-y)*sqrt(1-y/x)*exp(y-x)/x+(y/x).^y*exp(x-y)*sqrt(pi)/2/x>^1.5*erfc(sqrt(x-y)))*(2/z.^2+1/k.^2)*(2/3*y*((y-2)*0.5*betainc(1-y/x,0.5,y-1)-( f(x,y)=exp(-(x+y)) x>0 y>0 求Z=(X+Y)/2的概率密度.为什么不能所求密度不等于 ∫f(x,2z-x)dx? Unexpected MATLAB operator.[x,y]=meshgrid(100:1:500,-200:1:200);z=10./(2*pi.*(4+(2.*x./(x.^2+y.^2).^0.5)).*0.044.*x.^2.*((1+0.0001.*x).^0.5)).exp(-y.^2./(2.*(0.22.*x*(1+0.0001.*x)).^0.5)).*(exp(-9.^2./(0.08.*x.^2))+exp(-11.^2./(0.08.*x.^2)));shading matlab peaks函数 z = 3*(1-x).^2.*exp(-(x.^2) - (y+1).^2)- 10*(x/5 - x.^3 - y.^5).*exp(-x.^2-y.^2)- 1/3*exp(-(x+1).^2 - y.^2)函数表达式里的小数点可忽略吗,如果不能,表达式又是什么?图片