Removing a TEX arrow symbol from String

hello.

I have several text objects on a plot that I want to alter. Its actually created using the TEX interpreter in the text function:

txt='E4E'
txt=horzcat('\leftarrow',txt);
text(app.UIAxes,x,y,txt,'Color',cl,'FontSize',12,'Interpreter', 'tex','HorizontalAlignment','left','VerticalAlignment','middle');

Sometimes the rightarrow is used.

 Text (532 E4E\rightarrow) with properties:

                 String: '532 E4\rightarrow'
               FontSize: 20
             FontWeight: 'normal'
               FontName: 'Helvetica'
                  Color: [0 1 0]
    HorizontalAlignment: 'left'
               Position: [320 5100 0]
                  Units: 'data'
                  

I want to remove the arrows, and have tried this.

 htext=findobj(app.UIAxes,'Type','text');
 n=numel(htext);             

for i=1:n
    h=htext(i)    
    s1='\rightarrow'
    s2='\leftarrow'
    newStr=erase(h.String,s1);   %Delete S1 if present
    newStr=erase(h.String,s1);   %Delete S2 if present
    h.String=newStr;              %reassign           
end

But it only does one arrow orientation?

Answer 1

[Subhadeep Koley]

Your code is almost correct but, before erasing you need to check whether the h.String contains \leftarrow or \rightarrow. Use the code below.

htext=findobj(app.UIAxes, 'Type', 'text');
n = numel(htext);
for i = 1:n
    h = htext(i);
    s1 = '\rightarrow';
    s2 = '\leftarrow';
    if contains(h.String, s1,'IgnoreCase',true)
        newStr = erase(h.String,s1);
        h.String = newStr;
    else
        newStr = erase(h.String,s2);
        h.String = newStr;
    end
end

[Jason]

Thanks. I had assumed erase would not do anything if the S1 or S2 weren't present.

Jason