How do i fix line length errors in matlab

I amtrying to create a figure in which I am to insert lengths (1 : length) but i keep getting errors:

Unable to perform assignment because the size of the left side is 1-by-4 and the size of the right side

is 1-by-3.

clear YTick1 YLabel

YTick1 = [ -20:20:140 ]

for i=1:length(YTick1)

if YTick1(i) == -20

YLabel1(i:i,1:4) = [ num2str(YTick1(i), '%4.0f') ];

elseif YTick1(i) > -20 & YTick1(i) < 0

YLabel1(i:i,1:3) = [ num2str(YTick1(i), '%3.0f') ];

elseif YTick1(i) == 0

YLabel1(i:i,1:1) = [ num2str(YTick1(i), '%1.0f') ];

elseif YTick1(i) > 0

YLabel1(i:i,1:2) = [ num2str(YTick1(i), '%2.0f ') ];

end

end

clear YTick2 YLabel2

YTick2 = [ -20:20:140 ]

for i=1:length(YTick2)

if YTick2(i) < -20 & YTick2(i) < 0

YLabel2(i:i,1:4) = [ num2str(YTick2(i), '%4.0f') ];

elseif YTick2(i) > -20 & YTick2(i) < 0

YLabel2(i:i,1:3) = [ num2str(YTick2(i), '%3.0f') ];

elseif YTick2(i) == 0

YLabel2(i:i,1:1) = [ num2str(YTick2(i), '%1.0f') ];

elseif YTick2(i) > 0 & YTick2(i) < 140

YLabel2(i:i,1:2) = [ num2str(YTick2(i), '%2.0f') ];

end

end

Answer 1

[Voss]

If I understand correctly what you are trying to do, it is to fill in a 2D character array YLabel1, each row of which corresponds to a label of one YTick, which are known.

Instead of specifying the number of characters each label should have, based on the tick value, you can use a more general format in num2str, then see how long the resulting label is, and put it in place after its length is known:

YTick1 = [ -20:20:140 ]

YTick1 = 1×9

-20 0 20 40 60 80 100 120 140

for i=1:length(YTick1)
    str = num2str(YTick1(i), '%.0f');
    YLabel1(i,1:numel(str)) = str;
end 
YLabel1

YLabel1 = 9×3 char array
    '-20'
    '0  '
    '20 '
    '40 '
    '60 '
    '80 '
    '100'
    '120'
    '140'

By the way, it may be more convenient to use a cell array YLabel1 rather than a 2D character array:

YLabel1 = sprintfc('%.0f',YTick1)

YLabel1 = 1×9 cell array
    {'-20'}    {'0'}    {'20'}    {'40'}    {'60'}    {'80'}    {'100'}    {'120'}    {'140'}