MATLAB: How to change the color of individual bars in a bar chart

barchart;

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See attached demo.

Sorry - it's basically the same as what Sean did, just fancier and more flexible. You could put a wrapper around it to make it easier to use though.

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MATLAB: How to define an arbitrary constant for equations

If you are talking about making an assumption, you can do it as follows:

v1=6;
v3=18;
syms v2 v4 v5 v6
eqn1= -v4+v5==-v3;
eqn2= -v2+v6==v3;
eqn3= -v5-v6==-v1;
assume(v6~=0)
[v2 v4 v5 v6]=solve(eqn1, eqn2, eqn3);
[v2 v4 v5 v6]

MATLAB: How to select different colors and legend for the bar plot?

For the first part of your question, you can do so as follows:

x = rand(3,2);
h = bar (x);
h(1).FaceColor = 'red'
h(2).FaceColor = 'blue'

For the second part, patterned face colours aren't provided for with the bar() function. When you plot a bar chart such as:

h = bar(rand(3,6))

you can continue to modify the colors of any model using the same procedure as above. Additionally the legend will update for you accordingly:

legend('model A','model B','model C','model D','model E','model F')

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Related Solutions

MATLAB: How to define an arbitrary constant for equations

MATLAB: How to select different colors and legend for the bar plot?

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