matla南钢音b RANDS函数的问题

问题补充说明：[a,b]=rands(2,2)a = -0.4205 0.0682 -0.3176 0.4542b = -0.3814 0.6770为什么a b 矩阵列数不同呢，希望高手详细解答，万分感谢。

这个问题和神经元算法实现有关。

你看一下程序的源代码，注意看最下下面标出的那两行:

function[w,b]=rands(s,pr)

%RANDSSymmetricrandomweight/biasinitial来自izationfunction.

%

%Syntax

%

%W=rands(360问答S,PR)

%M=rands(S,R)

%v=rand右玉晚比足s(S);

%

%Descrip帝品沙烧井生有tion

%

%RANDSisaweight/biasinitializationfunction.

%

%RANDS(S,PR)takes,

%S-numberofneurons.

%PR-Rx2matrixofRinputranges.

%andreturnsanS-by-Rweightmatrixofrandomv施于aluesbetween-1and1.

%

%RANDS(S,R)returnsan非少胞阶六S-by-Rmatrixofrandomvalues.

%RANDS(S)returnsanS-by-1vectorofrandomvalues.

%

%Examples

%

%Herethreeset列sofrandomvaluesaregeneratedwithRANDS.

%

%rands(4,[01;-22])

%rands(4)

%rands(2,3)

%

%Netw孙选都谈离地论坚够orkUse

%

%Topreparetheweightsandt一看激角英笑非略呀hebiasoflayeriofacustomnet缺布铁班治紧work

%tobeini地专着速置团须滑林tializedwithRA针NDS:

%1)SetNET.initFcnto'initlay'.

%(NET.initParamwillautomaticallybecomeINITLAY'sdefaultparameters.)

%2)SetNET.layers{i}.initFcnto'initwb'.

%3)SeteachNE充缩名室步困货严序成林T.inputWeights{i,j}.initFc息务仍字好nto'rands'.

%SeteachNET.layerWeights{i,j}.initFcnto'rands';

%SeteachNET.biases{i}.in首货队itFcnto'rands'.

%

%ToinitializethenetworkcallINIT.

%

%See都械善alsoRANDNR,RANDNC,INITWB,INITLAY,INIT

%MarkBeale,1-31-92

%Revised12每和搞行阿工缺热迅阶说-15-93,MB

%Re至段vised11-31-97,MB

%Copyright1992-2008TheMathWorks,Inc.

%$Revision:1.1.6.7$$Date:2008/06/2008:04:33$

fn=mfilename;

if(nargin<1),error('NNET:Arguments','Notenougharguments.');end

ifischar(s)

switch(s)

case'name'

w='Midpoint';

otherwise,error('NNET:Arguments',['Unrecognizedcode:'''s''''])

end

return

end

ifnargin==1

r=1;

elseifsize(pr,2)==1

r=pr;

else

r=size(pr,1);

end

w=2*rand(s,r)-1;//看着个地方

%**[NNT2Support]**

ifnargout==2

b=2*rand(s,1)-1;//看着个地方

end])