matlab学习之matlab的入门
用于获得帮助文档，可以用help matlab中的注释是 %
>> help exp
exp Exponential.
exp(X) is the exponential of the elements of X, e to the X.
For complex Z=X+i*Y, exp(Z) = exp(X)*(COS(Y)+i*SIN(Y)).
See also expm1, log, log10, expm, expint.
重载的方法:
zpk/exp
tf/exp
codistributed/exp
gpuArray/exp
fints/exp
xregcovariance/exp
sym/exp
矩阵的输入
>> a=[1,2,3;4,5,6]
a =
1 2 3
4 5 6一些特殊的符号
转置矩阵
>> a'
ans =
1 4
2 5
3 6
产生行向量
>> t=[0:0.1:10]
t =
Columns 1 through 13
0 0.1000 0.2000 0.3000 0.4000 0.5000 0.6000 0.7000 0.8000 0.9000 1.0000 1.1000 1.2000
Columns 14 through 26
1.3000 1.4000 1.5000 1.6000 1.7000 1.8000 1.9000 2.0000 2.1000 2.2000 2.3000 2.4000 2.5000
Columns 27 through 39
2.6000 2.7000 2.8000 2.9000 3.0000 3.1000 3.2000 3.3000 3.4000 3.5000 3.6000 3.7000 3.8000
Columns 40 through 52
3.9000 4.0000 4.1000 4.2000 4.3000 4.4000 4.5000 4.6000 4.7000 4.8000 4.9000 5.0000 5.1000
Columns 53 through 65
5.2000 5.3000 5.4000 5.5000 5.6000 5.7000 5.8000 5.9000 6.0000 6.1000 6.2000 6.3000 6.4000
Columns 66 through 78
6.5000 6.6000 6.7000 6.8000 6.9000 7.0000 7.1000 7.2000 7.3000 7.4000 7.5000 7.6000 7.7000
Columns 79 through 91
7.8000 7.9000 8.0000 8.1000 8.2000 8.3000 8.4000 8.5000 8.6000 8.7000 8.8000 8.9000 9.0000
1到10为范围 0.1为间隔点
t = linspace(n1,n2,n) 产生 从n1 到n2 的均匀分布的n个数
特殊矩阵 单位矩阵 0矩阵 对角矩阵
>> zeros(3)
ans =
0 0 0
0 0 0
0 0 0
>> eye(2)
ans =
1 0
0 1
>> diag(5)
ans =
5
结构体的定义，还有细胞数组的定义
直接用.用属性赋值的方法 来进行赋值
多项式的生成
>> p=[1,-6,11,6]
p =
1 -6 11 6
>> poly2sym(p,'x')
ans =
x^3 - 6*x^2 + 11*x + 6
poly函数用于生成n*n的矩阵
>> poly(5)
ans =
1 -5还有多项式的计算
>> p=[1,3,2];
>> a=[1,2;3,4];
>> polyvalm(p,a)
ans =
12 16
24 36
还有多项式的除法
绘图的一些基本操作
>> p=[1,2,3]; >> a=[2,3,4]; >> plot(p,a)
>> x=0:0.25:5; >> y1 = x .^ 0.1; >> y2 = x .^ 0.5; >> y3 = x .^ 0.8; >> y4 = x .^ 1.5; >> t = 0:0.001:2*pi; >> hold on; >> plot(3 * cos(t), 3 * sin(t)) >> plot(x,y3,'gp--')
>> t = 0:pi/50:10*pi; >> plot3(sin(t),cos(t),t);
首先定义好 fun1 函数 随后在matlab 控制台进行加载
绘制等高线的函数
>> a = [1,2;3,4];
>> any(a)
ans =
1 1
>> all(a)
ans =
1 1
>> find(a)
ans =
1
2
3
4
if for switch 和while 循环 都以end函数来做结尾
>> a = rand(1,10);
>> fid = fopen('d,txt','w');
>> fprintf(fid,'%8.4f','w');
>> fclose(fid);
>> load d.txt
>> d
d =
[]
>> fid = fopen('d,txt','w');
>> fid = fopen('d.txt','w');
>> fprintf(fid,'%8.4f','w');动画的制作
>> for j = 1:30 mesh(cos(4*pi*j/30)*z,z) m(j) = getframe end
