Setting a textbox returning error 'Unable to resolve the name'

I have a GUI function that defines a few text boxes under the structure S. When calling to update the value of the text box named 'S.Text_for_display' within a seperate function called 'Speak' I recive the error 'Unable to resolve the name 'S.Text_for_display'.'.

function []=Speak(txt)
set(S.Text_for_display,'String','','LineStyle','none','FontSize',14,'FontName','Comic Sans... MS','FitBoxToText','off');
len=length(txt);
for i=1:len;
    if i<=len;
        Display(txt(1:i));
        pause(.05);
    else 
        Display(txt);
    end
end
end

[Walter Roberson]

for i=1:len;
    if i<=len;
        Display(txt(1:i));
        pause(.05);
    else 
        Display(txt);
    end

In a for loop that goes 1:len it is certain that i <= len so there is no point in having the if

Answer 1

[Dyuman Joshi]

The function does not know what "S" is. You need to pass it as an input.

And the font name 'Comic Sans MS' does not have ellipses (3 dots) in it.

%For cross-check
listfonts

ans = 14×1 cell array
    {'Arial'          }
    {'Arial Black'    }
    {'Arial Narrow'   }
    {'Comic Sans MS'  }
    {'Courier'        }
    {'Courier New'    }
    {'Georgia'        }
    {'Helvetica'      }
    {'Impact'         }
    {'Terminal'       }
    {'Times'          }
    {'Times New Roman'}
    {'Trebuchet MS'   }
    {'Verdana'        }

[lewis williamson]

Thanks for the reply. So I actually included the '...' for the fomatting of the question but I reaslise now that this would be bad and would not work, thank you. additionally, how would I pass "S" into the function?

[Dyuman Joshi]

If you want to use ellipses, you should use it after a name-value arguement pair, I've shown an example below -

%Modify function to add S as an input
%                      v
function []=Speak(txt, S)
    set(S.Text_for_display,'String','','LineStyle','none','FontSize',14,...
     'FontName','Comic Sans MS','FitBoxToText','off');
    len=length(txt);
                    for i=1:len;
                            if i<=len;
                                Display(txt(1:i));
                                pause(.05);
                            else 
                                Display(txt);
                            end
                    end
end

[lewis williamson]

Ok, I'm still not sure how to parse the acutal textbox into the function here. If i try running your fucntion you have provided It does not recognise the textbox: 'method, property, or field 'Text_for_display' for class 'matlab.graphics.shape.TextBox''

[Dyuman Joshi]

Could you share the struct "S"? Use the paperclip button to attach.

How are you calling the function?