color changing bar graph

how can i plot a horozontal bar graph where the bars color change acording to a formula?

i have 5 different hights (70, 115, 164, 216, 270) each going from 0 to 130 that change intensity acording to different formula for each hight

i want to draw a horozontal bar graph with hights on y axes 0-130 on y axes and the bar changing colors accoring to the formulas

[Mehmed Saad]

can you give me the formula from which you want to change the color

[ralph glastonbury]

Y = 0,000000272010410X^3 - 0,000071941838974X^2 + 0,004930888800712X + 1,902355241509030

it should look like a color map but change colors according to this formula

[Mehmed Saad]

something like this

or this

[ralph glastonbury]

yes but the color should change acording to the formula

[Mehmed Saad]

yup but i didn't get your formula

colors are in the format of [r g b], how can you get these 3 values from your formula?

  Y = 0,000000272010410X^3 - 0,000071941838974X^2 + 0,004930888800712X + 1,902355241509030 

[ralph glastonbury]

i want something like a color map where the color change as y change

like the botom graph you send. the y axis stays at 1 but the colors in the bar changes acording to the formula

Y = 0,000000272010410X^3 - 0,000071941838974X^2 + 0,004930888800712X + 1,902355241509030

[Mehmed Saad]

color has three components [R,G,B], the formula should be such that it calculates the value of all three components for example

R = 0.15*X^2+0.12786*X^3+1.956;

G = 0.75*X^2+0.52786*X^3+0.956;

B = 0.95*X^2+0.72786*X^3+3.956;

Now that is what i want

[ralph glastonbury]

Sorry i think i miscommunicated

The formula is a trend line for some data I have

I want to show how the data changes for x from 0 to 130

For that numbers y changes from about 1.9 to about 2.01

So for example if x=0, y would be about 1.9 it should show blue on the bar

And if x=130 y would be less than 2.01 and that should show red

Like on the jet colormap

So the color would change as x change

Does this make sense?

[Mehmed Saad]

is this right? i am only change R and B values not G

[ralph glastonbury]

yes that is what im looking for

Answer 1

[Mehmed Saad]

Now i am giving you code for only generating 1 peak which is random, you ve to generate the remaining by yourself

figure,
h=barh([0 1],[zeros(1,131);randi(3,1,131)],'stacked','BarWidth',0.4);
X = 0:130;
Y = 0.000000272010410*X.^3 - 0.000071941838974*X.^2 + 0.004930888800712*X + 1.902355241509030;
Z=Y-min(Y);
Z=Z/max(Z);

for i=1:131
    h(i).FaceColor = [1-Z(i) 0 Z(i)];%m(i,:);
    h(i).EdgeColor = [1-Z(i) 0 Z(i)];%m(i,:);
end

[ralph glastonbury]

thank you so much