function?hh=streakarrow（X0Y0UVnparrow）

%H?=?STREAKARROW（XYUVnparrow）?creates?“curved“?vectors?from?
%?2D?vector?data?U?and?V.?All?vectors?have?the?same?length.?The
%?magnitude?of?the?vector?is?color?coded.
%?The?arrays?X?and?Y?defines?the?coordinates?for?U?and?V.
%?The?variable?np?is?a?coefficient?>0?changing?the?length?of?the?vectors.
%?????np=1?corresponds?to?a?whole?meshgrid?step.?np>1?allows?ovelaps?like
%?????streamlines.
%?The?parameter?arrow?defines?the?type?of?plot:?
%???arrow=1?draws?“curved“?vectors
%???arrow=0?draws?circle?markers?with?streaks?like?“tuft“?in?wind?tunnel
%???studies

%?Example:
????%load?wind
????%N=5;?X0=x（::N）;?Y0=y（::N）;?U=u（::N）;?V=v（::N）;
????%H=streakarrow（X0Y0UV1.50）;?box?on;?
????
%?Bertrand?Dano?10-25-08
%?Copyright?1984-2008?The?MathWorks?Inc.?


????
DX=abs（X0（11）-X0（12））;?DY=abs（Y0（11）-Y0（21））;?DD=min（[DX?DY]）;
ks=DD/100;??????%?Size?of?the?“dot“?for?the?tuft?graphs
np=np*10;???
alpha?=?5;??%?Size?of?arrow?head?relative?to?the?length?of?the?vector
beta?=?.25;?%?Width?of?the?base?of?the?arrow?head?relative?to?the?length

XY=stream2（X0Y0UVX0Y0）;
%np=15;
Vmag=sqrt（U.^2+V.^2）;
Vmin=min（Vmag（:））;?Vmax=max（Vmag（:））;
Vmag=Vmag（:）;?x0=X0（:）;?y0=Y0（:）;

%ks=.1;
cmap=colormap;
for?k=1:length（XY）
????F=XY（k）;?[L?M]=size（F{1}）;
????????if?L????????????F0{1}=F{1}（1:L:）;
????????????if?L==1
????????????????F1{1}=F{1}（L:）;
????????????else
????????????????F1{1}=F{1}（L-1:L:）;
????????????end
????????????
????????else
????????????F0{1}=F{1}（1:np:）;
????????????F1{1}=F{1}（np-1:np:）;
????????end
????P=F1{1};
????vcol=floor（（Vmag（k）-Vmin）./（Vmax-Vmin）*64）;?if?vcol==0;?vcol=1;?end
????COL=[cmap（vcol1）?cmap（vcol2）?cmap（vcol3）];
????hh=streamline（F0）;
????set（hh‘color‘COL‘linewidth‘.5）;

????if?arrow==1&L>1
???????x1=P（11）;?y1=P（12）;?x2=P（21）;?y2=P（22）;
???????u=x1-x2;?v=y1-y2;?u=-u;?v=-v;?
???????xa1=x2+u-alpha*（u+beta*（v+eps））;?xa2=x2+u-alpha*（u-beta*（v+eps））;
???????ya1=y2+v-alpha*（v-beta*（u+eps））;?ya2=y2+v-alpha*（v+beta*（u+eps））;
???????plot（[xa1?x2?xa2][ya1?y2?ya2]‘color‘COL）;?hold?on
???else
????rectangle（‘position‘[x0（k）-ks/2?y0（k）-ks/2?ks?ks]‘curvature‘[1?1]‘facecolor‘COL?‘edgecolor‘COL）
????end
????
????????????
?????
end

axis?image
%colorbar?vert
%h=colorbar;?
%set（h‘ylim‘[Vmin?Vmax]）

?屬性????????????大小?????日期????時(shí)間???名稱(chēng)
-----------?---------??----------?-----??----
?????文件????????2397??2014-02-12?12:40??streakarrow.m
?????文件?????????737??2014-02-12?12:40??streakbar.m
?????文件????????1313??2014-02-12?12:40??license.txt