Bar Graph Stacked with Negative and Positive values

Hi.

I'm trying to get a plot to act like the graph function in excel that stacks values together. It does this by putting all positive values on the positive part of the axis, and the negative values on the negative side.

Unfortunatly when I use bar(X,'stack') with matlab it doesn't do this.

Is there any way to get this same functionality? Thanks.

Answer 1

[Brishen]

I think that I figured this out. The trick is to do two graphs and to seperate out the positive and negative values:

>> X = rand(4,3) - 0.5;
>> Xneg = X;
>> Xneg(Xneg>0) = 0;
>> Xpos = X;
>> Xpos(Xpos<0) = 0;
>> hold on
>> bar(Xneg,'stack')
>> bar(Xpos,'stack')
>> hold off

Answer 2

[Walter Roberson]

It isn't clear to me that what you describe would be appropriate? 'stacked' means to show the cumulative sum with internal divisions. If some members of the bar are positive and others are negative, then if you have a break at the axis then you misrepresent the cumulative sum.

[Brishen]

I agree with what you're saying, but I'd still like to be able to have this function in a graph. The reason is that there are times when you have data that fall into the same category but can be both negative and positive. Although the net number is interesting it can also be important to see the sums of both the signs and to see how much each row contributed to it.

If stacked isn't the best solution here then I'm completely open to another.

Thanks.

[Walter Roberson]

Something like this, perhaps:

t1 = X;

t2 = X;

t1(t1<0) = nan;

t2(t2>0) = nan;

Xsplit = reshape([t2.';t1.'],size(t,2),[]).';

bar(Xsplit,'stacked')

Answer 3

[Koorosh Aslansefat]

I would suggest to try this:

bar(X,'BaseValue',0)