How to repeat subjects label by simplify way?

Hi everyone

I have row_header like this:

  row_header={'Subjects','NB1','NB1','NB1','NB1','NB1','NB1','NB1','NB1','NB1','NB1','NB2','NB2','NB2','NB2','NB2','NB2','NB2','NB2','NB2','NB2',...
      'NB3','NB3','NB3','NB3','NB3','NB3','NB3','NB3','NB3','NB3','NB4','NB4','NB4','NB4','NB4','NB4','NB4','NB4','NB4','NB4',...
      'NB5','NB5','NB5','NB5','NB5','NB5','NB5','NB5','NB5','NB5','NB6','NB6','NB6','NB6','NB6','NB6','NB6','NB6','NB6','NB6',...
      'NB7','NB7','NB7','NB7','NB7','NB7','NB7','NB7','NB7','NB7','NB8','NB8','NB8','NB8','NB8','NB8','NB8','NB8','NB8','NB8',...
      'NB9','NB9','NB9','NB9','NB9','NB9','NB9','NB9','NB9','NB9','NB10','NB10','NB10','NB10','NB10','NB10','NB10','NB10','NB10','NB10',...
      'NB11','NB11','NB11','NB11','NB11','NB11','NB11','NB11','NB11','NB11','NB12','NB12','NB12','NB12','NB12','NB12','NB12','NB12','NB12','NB12',...
      'NB13','NB13','NB13','NB13','NB13','NB13','NB13','NB13','NB13','NB13','NB14','NB14','NB14','NB14','NB14','NB14','NB14','NB14','NB14','NB14',...
      'NB15','NB15','NB15','NB15','NB15','NB15','NB15','NB15','NB15','NB15','NB16','NB16','NB16','NB16','NB16','NB16','NB16','NB16','NB16','NB16',...
      'NB17','NB17','NB17','NB17','NB17','NB17','NB17','NB17','NB17','NB17','NB18','NB18','NB18','NB18','NB18','NB18','NB18','NB18','NB18','NB18'};     

How to achieve it in a simpler way？

Thankyou

guke su

Answer 1

[madhan ravi]

compose("NB%d",1:10) % edited after Guillaume’s comment

[zb li]

HI @madhan ravi I run and have wrong waring : Undefined function or variable 'compose'.

[madhan ravi]

string(sprintfc('NB%d',1:10))

[Image Analyst]

Strange, sprintfc() is not in my help, but it runs it without error.

Anyway, aren't you also going to show how to use that with repelem() and how to prepend 'Subjects' to provide a complete solution?

[madhan ravi]

Yes sir was going to , was expecting the OP to ask that question but he didn't I thought he didn't have enough interest ask that question though:

{['Subject' repelem(string(sprintfc('NB%d',1:18)),1,10)]}

[Guillaume]

If the OP doesn't have compose, then he won't have the string function either (both were introduced in 2016b.

Note that there is never any need for string(compose(...)), Pass a string directly to compose if you want a string out:

compose("Nb%d", 1:10)  %will return strings

sprintfc is a well known but completely undocumented function. Any use of it should be accompanied by a comment stating that the function is undocumented, unsupported, and could be removed without any warning in a future version of matlab.

[madhan ravi]

Thank you very much Guillaume , I couldn’t recall the double quote as a string at the moment I commented because applying compose with a single string resulted to separate cells so that’s why I had to use string() syntax but after your comment it’s really clear now because double quotes resulted with a string array .

[zb li]

Thank you very much. My matlab ver.2016a ,I don't have string function ,so I write down the following code

infostr= ['Subject' repelem(sprintfc('NB%d',1:18),1,10)]; % edited after madhan ravi’s comment

[madhan ravi]

Anytime :)