Hello Ravi,
If you just want to select a specific bar out of your data set, then consider the code below. But you really need to be more descriptive as it's difficult to tell what is it that you want to achieve.
% generate random data set between 1 and 20
data = randi(20,1,20);
x = 1:20;
% plot the 'data'
figure
bar(x, data)
set(gca,...
'xTick', x)
% select one specific column
specificColumn = randi(20)
% first way - just plot the selected bar
figure
bar(data(specificColumn));
% second way - plot the selected bar in its place
% using logical vector
vector = false(1,length(data));
vector(specificColumn) = true;
dataChanged = data;
dataChanged(~vector) = 0;
figure
bar(dataChanged)
set(gca,...
'xTick', x)
% 3rd way - highlight the selected bar
% As in:
% https://uk.mathworks.com/help/matlab/ref/bar.html?s_tid=doc_ta#d119e63716
figure
b = bar(data);
b.FaceColor = 'flat';
b.CData(specificColumn,:) = [1 0 0];
set(gca,...
'xTick', x)
