drbinzhao的专栏

format long g 关闭科学记数法 matlab

files = dir(‘*.jpg’); len=length(files); for i=1:len oldname=files(i).name; newname=strcat(‘safetyvest’,num2str(i),’.jpg’); command = [‘rename’ 32 oldname 32 newname]; status = d...

[DIFF,DEA,MACDbar]=ZB_MACD(StockData(:,5),12,26,9) plot(DIFF) [a,b]=findpeaks(DIFF) hold on plot(b,a,’ro’) [c,d]=findpeaks(-DIFF); hold on plot(d,-c,’ro’)

B cell save('3000wrods.mat','B');  B=load('3000wrods.mat') c=struct2cell(B); d=c{1}

load data： import data； B=a B=[B a1] B=sortrows(B,2) B{1,2}='aaa'

javaaddpath 'C:\Program Files\MATLAB\R2016a\mysql-connector-java-5.1.36-bin.jar';

syms x a b c solve('a*x^2+b*x+c=0',x)  syms p1 p2 p3 t1 t2 t3 t p n f1=(p3+p2)*(t3-t2)/2+(p2+p1)*(t2-t1)/2-(p3+p1)*(t3-t1)/2 f2=(p3+p)*(t3-t)/2+(p+p1)*(t-t1)/2-(p3+p1)*(t3-t1)/2  f3

>> syms x; >> y=3*x*(x+1) >> x=2 x =      2 >> eval(y) ans =     18

>> s=0:2:8 s =      0     2     4     6     8 >> c=[1 18 59 124 213] c =      1    18    59   124   213 >> cftool

f1=3*x*(x+1)+1 f2=3*(x+1)*(x+2)+1 expand(f2-f1)ans =6*x + 6 solve(f1==19)ans =-3 2 19+6*2+6 ans =37 A=solve(f1==22) b=22+6+6*A(2) floor(b)

分解 多项式扩展 同幂合并 求方程 syms x y; factor(x^3-y^3) expand((x-2)*(x-4)) expand(cos(x+y)) expand((exp(x)+x)*(x+2)) ans =2*x + 2*exp(x) + x*exp(x) + x^2 collect((exp(x)+x)*(x+2)) ans =x^2