MATLAB: Removing a TEX arrow symbol from String

handlesstringtex

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?

Best Answer

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
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