Error using horzcat with num2str function for creating character class

>>I am not understanding why the for double figure value, it is creating problems. Could anyone please help me with the situation?

Nt=10;Bd=9;Ns=1;

Str=['psd_c_',num2str(Nt),'_by_',num2str(Bd)','_shaded_',num2str(Ns)]

Str =

psd_c_10_by_9_shaded_1

But,

Nt=10;Bd=10;Ns=1;

Str=['psd_c_',num2str(Nt),'_by_',num2str(Bd)','_shaded_',num2str(Ns)]

Error using horzcat

Dimensions of matrices being concatenated are not consistent.

Answer 1

[madhan ravi]

Str = sprintf('psd_c_%d_by_%d_shaded_%d',Nt,Bd,Ns)
doc sprintf % read it

[Stephen23]

MD RAQUIBUZZAMAN'S "Answer" moved here:

Thank you. very much.

[Stephen23]

@MD RAQUIBUZZAMAN: you should accept madhan ravi's answer if it resolves your question.

Answer 2

[Steven Lord]

You have one extra ' after your second num2str call. That's not a problem when Bd is a number with just one digit (the transpose of '5' is '5', for example) but becomes a problem when Bd is not an integer between 0 and 9 inclusive (the transpose of '10' has two rows.)

There are a couple possible solutions:

• You could remove that extra '.
• You could use sprintf as madhan ravi suggested.
• You could use a string array as shown below.

Nt=10;
Bd=10;
Ns=1;
Str="psd_c_" + Nt + "_by_" + Bd + "_shaded_" + Ns

Depending on the release you're using, many of the functions that accept char array inputs will accept string inputs. If I had to guess I'd say you want to use this as a file name or as the title, xlabel, ylabel, etc. of an axes. At least in release R2018b that should work though you'd want to specify the 'Interpreter' property of the title so the underscore characters are displayed as underscores not interpreted as subscripts.

title(Str, 'Interpreter', 'none')

[MD RAQUIBUZZAMAN]

Yeah. Now it is clear to me. Thank you for the clear explanation.