small numbers in the legend

leg =

  3×1 cell array

    {'1-Preset1-  ==>0 $'  }
    {'2-Preset1_1-  ==>0 $'}
    {'3-Preset1_2-  ==>0 $'}

    
leg=compose('%s',strArr(ii));
legend(Ax_Eq,leg,'Location','northwest'); 

hi,it'a possible to draw size normal?

Invalid expression. Check for missing or extra characters.

Answer 1

[Voss]

The default text interpreter, tex, is interpreting the underscores as subscripts, so you can either:

(1) escape the underscores with backslashes

figure
Ax_Eq = axes();
plot(magic(3));

leg = { ...
    '1-Preset1-  ==>0 $'; ...
    '2-Preset1\_1-  ==>0 $'; ...
    '3-Preset1\_2-  ==>0 $'};
legend(Ax_Eq,leg,'Location','northwest')

or (2) change the interpreter to 'none'

figure
Ax_Eq = axes();
plot(magic(3));

leg = { ...
    '1-Preset1-  ==>0 $'; ...
    '2-Preset1_1-  ==>0 $'; ...
    '3-Preset1_2-  ==>0 $'};
legend(Ax_Eq,leg,'Location','northwest','Interpreter','none')

Option 2 is probably easier in this case.