如何在用Matlab画柱状图

画柱状图比较方便的还是Excel,不过作为逼格比较高的我们有必要学习一下如何用Matlab玩转柱状图。

比较好的参考资料:
1. http://blog.sina.com.cn/s/blog_4bc179a80100ki72.html
2. http://blog.csdn.net/hao_ding/article/details/9472103

y=[67.84 68.89 71.54 71.67;67.17 69.47 73.41 73.14];
b=bar(y);
grid on;
ch = get(b,’children’);
set(gca,’XTickLabel’,{‘Dataset 1′,’Dataset 2′})
% 不知道为什么会报错,在Matlab2009,2011测试都不行
% set(ch,’FaceVertexCData’,[1 0 0;0 1 0; 0 0 1; 1 0 1]);
legend(‘Fea. 1′,’Fea. 2′,’Fea. 3′,’Fea. 4′);
xlabel(‘Datasets’);
ylabel(‘Precision’);

另一个比较好用的:
>> a=[1 2 3];
>> b=diag(a);
>> c=bar(b,’stack’);
>> color=[0 0 0.75;0 1 0;1 0.5 0];
>> for i=1:3
set(c(i),’FaceColor’,color(i,:));
end

====================但是问题来了,上面方式是以颜色区分不同柱状的,下面我们寻思靠图案来区分的方式==============
主要参考:http://blog.sciencenet.cn/blog-40165-308439.html

http://www.aos.wisc.edu/~dvimont/matlab/Graphics_Tools/applyhatch.html

function applyhatch(h,patterns,colorlist)
%APPLYHATCH Apply hatched patterns to a figure
% APPLYHATCH(H,PATTERNS) creates a new figure from the figure H by
% replacing distinct colors in H with the black and white
% patterns in PATTERNS. The format for PATTERNS can be
% a string of the characters ‘/’, ‘\’, ‘|’, ‘-’, ‘+’, ‘x’, ‘.’
% a cell array of matrices of zeros (white) and ones (black)
%
% APPLYHATCH(H,PATTERNS,COLORS) maps the colors in the n by 3
% matrix COLORS to PATTERNS. Each row of COLORS specifies an RGB
% color value.
%
% Note this function makes a bitmap image of H and so is limited
% to low-resolution, bitmap output.
%
% Example 1:
% bar(rand(3,4));
% applyhatch(gcf,’\-x.’);
%
% Example 2:
% colormap(cool(6));
% pie(rand(6,1));
% legend(‘Jan’,'Feb’,'Mar’,'Apr’,'May’,'Jun’);
% applyhatch(gcf,’|-+.\/’,cool(6));
%
% See also: MAKEHATCH

% By Ben Hinkle, bhinkle@mathworks.com
% This code is in the public domain.

oldppmode = get(h,’paperpositionmode’);
oldunits = get(h,’units’);
set(h,’paperpositionmode’,'auto’);
set(h,’units’,'pixels’);
figsize = get(h,’position’);
if nargin == 2
colorlist = [];
end
bits = hardcopy(h,’-dzbuffer’,'-r0′);
set(h,’paperpositionmode’,oldppmode);

bwidth = size(bits,2);
bheight = size(bits,1);
bsize = bwidth * bheight;
if ~isempty(colorlist)
colorlist = uint8(255*colorlist);
[colors,colori] = nextnonbw(0,colorlist,bits);
else
colors = (bits(:,:,1) ~= bits(:,:,2)) | …
(bits(:,:,1) ~= bits(:,:,3));
end
pati = 1;
colorind = find(colors);
while ~isempty(colorind)
colorval(1) = bits(colorind(1));
colorval(2) = bits(colorind(1)+bsize);
colorval(3) = bits(colorind(1)+2*bsize);
if iscell(patterns)
pattern = patterns{pati};
elseif isa(patterns,’char’)
pattern = makehatch(patterns(pati));
else
pattern = patterns;
end
pattern = uint8(255*(1-pattern));
pheight = size(pattern,2);
pwidth = size(pattern,1);
ratioh = ceil(bheight/pheight);
ratiow = ceil(bwidth/pwidth);
bigpattern = repmat(pattern,[ratioh ratiow]);
if ratioh*pheight > bheight
bigpattern(bheight+1:end,:) = [];
end
if ratiow*pwidth > bwidth
bigpattern(:,bwidth+1:end) = [];
end
bigpattern = repmat(bigpattern,[1 1 3]);
color = (bits(:,:,1) == colorval(1)) & …
(bits(:,:,2) == colorval(2)) & …
(bits(:,:,3) == colorval(3));
color = repmat(color,[1 1 3]);
bits(color) = bigpattern(color);
if ~isempty(colorlist)
[colors,colori] = nextnonbw(colori,colorlist,bits);
else
colors = (bits(:,:,1) ~= bits(:,:,2)) | …
(bits(:,:,1) ~= bits(:,:,3));
end
colorind = find(colors);
pati = (pati + 1);
if pati > length(patterns)
pati = 1;
end
end

newfig = figure(‘units’,'pixels’,'visible’,'off’);
imaxes = axes(‘parent’,newfig,’units’,'pixels’);
im = image(bits,’parent’,imaxes);
fpos = get(newfig,’position’);
set(newfig,’position’,[fpos(1:2) figsize(3) figsize(4)+1]);
set(imaxes,’position’,[0 0 figsize(3) figsize(4)+1],’visible’,'off’);
set(newfig,’visible’,'on’);

function [colors,out] = nextnonbw(ind,colorlist,bits)
out = ind+1;
colors = [];
while out <= size(colorlist,1)
if isequal(colorlist(out,:),[255 255 255]) | …
isequal(colorlist(out,:),[0 0 0])
out = out+1;
else
colors = (colorlist(out,1) == bits(:,:,1)) & …
(colorlist(out,2) == bits(:,:,2)) & …
(colorlist(out,3) == bits(:,:,3));
return
end
end

而applyhatch函数需要调用下面的函数

function A = makehatch(hatch)
%MAKEHATCH Predefined hatch patterns
% MAKEHATCH(HATCH) returns a matrix with the hatch pattern for HATCH
% according to the following table:
% HATCH pattern
% ——- ———
% / right-slanted lines
% \ left-slanted lines
% | vertical lines
% – horizontal lines
% + crossing vertical and horizontal lines
% x criss-crossing lines
% . single dots
%
% See also: APPLYHATCH

% By Ben Hinkle, bhinkle@mathworks.com
% This code is in the public domain.

n = 6;
A=zeros(n);
switch (hatch)
case ‘/’
A = fliplr(eye(n));
case ‘\’
A = eye(n);
case ‘|’
A(:,1) = 1;
case ‘-’
A(1,:) = 1;
case ‘+’
A(:,1) = 1;
A(1,:) = 1;
case ‘x’
A = eye(n) | fliplr(diag(ones(n-1,1),-1));
case ‘.’
A(1:2,1:2)=1;
otherwise
error(['Undefined hatch pattern "' hatch '".']);
end

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