??? Error using ==> plot Invalid first data argument error

I have the following code

for k=1:size(Desc,1) %Data_All{j}(i,1)=strcat(Desc{i}(1,:)); Data_All1{j}{k,1}=strcat(Desc{k}(1,:)); Data_All1{j}{k,2}=strcat(Dataopen{k}(1,:)); Data_All2{j}{k,1}=strsplit((Data_All1{j}{k,2}),' '); A{j}{k,1}=Data_All2{j}{k,1}; C3{j}{k,1}=A{j}{k,1}{2}; a1=C3{1}{1,1}; a2=C3{1}{1,1}; plot(a1,a2); Data_All1{j}{k,3}=strcat(Dataend{k}(1,:));

end

but i am getting ??? Error using ==> plot Invalid first data argument

can anyone help

Answer 1

[Geoff Hayes]

Mekala - please format the above code so that it is readable. Highlight the code and press the {} Code button.

As well, please describe what your inputs are. Desc and Dataopen appear to be cell array of strings. Is this the case? Where is j initialized? If I run the above code, will it reproduce the error message that you have provided?

Given your use of strcat, strsplit, and naming of the variable Desc (for description?) it would appear that all of your arrays are populated with strings. This would include a1 and a2 which are inputs to the plot function

 plot(a1,a2);

If I try to pass strings (character arrays) to this function as

 plot('hello','world');

then I observe the same error as you

 Error using plot
 Invalid first data argument

The error is appropriate. Is this what you are doing, and if so, what are you trying to plot?

Answer 2

[Mekala balaji]

 clc;clear all;
clc
tic
FileList=dir('D:\Matlab2010\Filesfolder\Code for files\Textfilesreference\fewfiles/');
j=1;
for i=3:1:(size(FileList))
FileName{j}=FileList(i).name;
j=j+1;
%disp(FileName);
end
% for i=1:size(FileName,2)
% FileDate{j} = FileName{j}(00:50);
% end
for j=1:size(FileName,2)
    fin=fopen(['D:\Matlab2010\Filesfolder\Code for files\Textfilesreference\fewfiles/',FileName{j}],'r');
   s=1;
   while ~feof(fin)
       tt=fgetl(fin);    %Scan all lines
    %fclose(fin);
    %disp(FileName);
    if s>=25 && s<=41
        aa=(tt);
        Desc{s-24,:}=strsplit(aa(1:47));
        Dataopen{s-24,:}=strsplit(aa(50:65));
        Dataend{s-24,:}=strsplit(aa(72:size(aa,2)));

   end
   s=s+1;
   end
for k=1:size(Desc,1)
%Data_All{j}(i,1)=strcat(Desc{i}(1,:));
Data_All1{j}{k,1}=strcat(Desc{k}(1,:));
Data_All1{j}{k,2}=strcat(Dataopen{k}(1,:));
Data_All2{j}{k,1}=strsplit((Data_All1{j}{k,2}),' ');
A{j}{k,1}=Data_All2{j}{k,1};
C3{j}{k,1}=A{j}{k,1}{2};
C4{k}=strcat(C3{j});
C6{k}=str2num(C4{j});
%C5{j}{k,1}=strcat(C3{j}{k,1});
%C5{j}{k,1}=strcat(C3{j}{k,1});
% C6{j}{k,1}=str2num(C3{j}{k,1});
% C7{j}{k,1}=str2num(C3{j}{k,1});

%C6{j}{k,1}=str2num(C5{j}{k,1}); % C7{j}{k,1}=str2num(C3{j,1}); % plot(C6{j}{k,1},C7{j}{k,1}); Data_All1{j}{k,3}=strcat(Dataend{k}(1,:));

end

end

   toc

if true
  % code
end