matlab - repmat function does not work properly -

-

let consider following situation,for instance have given matrix , want make 0 centered matrix in columns,so

a=rand(4,3)  =      0.6948    0.4387    0.1869     0.3171    0.3816    0.4898     0.9502    0.7655    0.4456     0.0344    0.7952    0.6463

now 2 method works properly

a-repmat(mean(a),size(a,1),1)  ans =      0.1957   -0.1565   -0.2553    -0.1820   -0.2137    0.0476     0.4511    0.1703    0.0035    -0.4647    0.1999    0.2042

and also

bsxfun(@minus,a,mean(a))  ans =      0.1957   -0.1565   -0.2553    -0.1820   -0.2137    0.0476     0.4511    0.1703    0.0035    -0.4647    0.1999    0.2042

but somehow following method not work

b=mean(a)  b =      0.4991    0.5953    0.4421   a-repmat(b,1,4)  ans =       0     0     0     0     0     0     0     0     0     0     0     0

i have tried transpose but

a-repmat(b,1,4)' error using  -  matrix dimensions must agree.

also have tried following

a-repmat(b,1,3)' error using  -  matrix dimensions must agree.  >> a-repmat(b,1,3) error using  -  matrix dimensions must agree.  problem of  failure of method?

you not using proper syntax repmat function

in example ,you need create matrix of size 4 x 3 using repmat

now call repmat(a,k,j) repeats matrix a k times along first dimension (i.e vertically) , j times along second dimension (i.e, horizontally).

here, need repeat matrix mean 4 times in first dimension , 1 time in second dimension .

hence, correct call repmat repmat(mean,4,1) 

repmat(b,4,1)  ans =      0.4991    0.5953    0.4421     0.4991    0.5953    0.4421     0.4991    0.5953    0.4421     0.4991    0.5953    0.4421

it looks need know why method failing

repmat(b,1,4) %// returns 1x12 matrix while 3x4 matrix hence dimensions not agree while using @minus ans =      0.4991    0.5953    0.4421   0.4991    0.5953    0.4421   0.4991    0.5953    0.4421   0.4991    0.5953    0.4421

Comments

Post a Comment

Popular posts from this blog

database - VFP Grid + SQL server 2008 - grid not showing correctly -

-
i having problem, have grid called "gridbasica" , this: thisform.gridbase.recordsource = "sgviemp" sgviemp cursor made executing select sqlserver command sqlexec. when want modify registry, go form , the update there. so, when come form grid, grid isnt grid anymore, big white rectangle. reading around said: delete recordsource , asingt again. thisform.gridbase.recordsource = "" *--i sqlexe here thisform.gridbase.recordsource = "sgviemp" i , works, but, when click button modify again cursos updated modify form doesnt load fields did first time. could me out that? thanks in advance. --------------- edit ------------------ i have been doing recommended: lnselect = select(0) n = sqlexec(thisform.conexion,"select emp_ccodigo codigo, emp_cnombre 'nombre o razon social', emp_cnumrif 'r.i.f' sgviempr","sgviemp1") set echo on suspend select sgviemp zap in sgviemp *-- browse *--zaps correct
Read more

jquery - Set jPicker field to empty value -

-
im using jpicker color selector in form. have clear value set window/icon 'no color selected' state. i've tried following: $(':input[name="color"]').val(''); //access value directly. (does not affect jpicker) 2: $.jpicker.list[0].color.active.val('hex', '', this); //set color black , input value 000000, instead of empty string 3: $.jpicker.list[0].color.active.val(null, '', this); //does nothing none of 3 methods seems behave properly. in advance. this works me :) $.jpicker.list[0].color.active.val('v', null); here example: http://jsfiddle.net/3up7n/
Read more

.htaccess - htaccess convert request to clean url and add slash at the end of the url -

-
ok , searched more 4 days , more 20 posts here in stach or in websites without kind of success first here htaccess file rewriteengine on rewriterule ^([a-za-z0-9_]+)/?$ index.php?page=$1 [nc] rewriterule ^([a-za-z0-9_]+)\/([a-za-z0-9_]+)\/?$ index.php?page=$1&action=$2 [nc] i tried many codes 1 worked me can call request , works me www.example.com/pagename => www.example.com/index.php?page=pagename here questions , please provide me information "in detail" understand code well 1- how convert request automatically www.example.com/index.php?page=pagename www.example.com/pagename 2- if tried add slash @ end shows me page without images or styling mean www.example.com/pagename => works www.example.com/pagename/ => doesn't work that's :) for first part need 301 rule this: rewritecond %{the_request} /index\.php\?page=([^\s&]+) [nc] rewriterule ^ /%1? [r=301,l] for second part use absolute path in css, js, images files r
Read more