vertical line on x axis

subplot(1,3,2)

plot(a1,x1, 'black', a1, y1, 'r', a1,z1, 'b',LineWidth=5);

title('Consumption level, T=10')

xticks([0 1 2 3 4 5 6 7 8 9])

xticklabels({'0' '1' '2' '\color{red}S^*' '4' '5' '6' '7' '8' '9'})

ylim([60,90])

How can I add vertical line at the level s* from 0 to the black line?

Thank you,

Answer 1

[Voss]

x = 3;
y = interp1(a1,x1,x);
line([x,x],[0,y])

[Raushan]

Error using griddedInterpolant

The sample points must be finite.

Error in interp1 (line 170)

F = griddedInterpolant(X,V(:,1),method);

Error in plot10 (line 29)

p = interp1(a1,x1,l);

It shows me this erroe

[Voss]

Sounds like you have some non-finite elements (NaN or Inf). Try this:

x = 3;
idx = isfinite(a1) & isfinite(x1);
y = interp1(a1(idx),x1(idx),x);
line([x,x],[0,y])

[Raushan]

thank you, it doesn't work, i don't have infinite one

[Sam Chak]

Hi @Raushan,

All you have to do is to provide the data for a1 and x1. We will figure out what the issue is.

If both a1 and x1 are in the Workspace, then save them to a MAT-file, using this syntax

save('RaushanData', 'a1', 'x1')

Once completed, attach the MAT-file (RaushanData.mat) using the paperclip icon .

By the way, both approaches by @Voss and @Star Strider work when the all elements in the data are finite.

a1  = 0:9;                          % hypothetical data
a1e = [min(a1) max(a1)]             % extrema of a1

a1e = 1×2

0 9

x1  = linspace(8, 78, numel(a1));   % hypothetical data
x1e = [min(x1) max(x1)]             % extrema of x1

x1e = 1×2

8 78

xq  = 3;                            % from S* mark (query point)
yq  = interp1(a1e, x1e, xq);        % interpolate

% Plot data (black line)
plot(a1, x1, 'black', LineWidth=5);
xticks([0 1 2 3 4 5 6 7 8 9])
xticklabels({'0' '1' '2' '\color{red}S^*' '4' '5' '6' '7' '8' '9'})
hold on

% Plot vertical line (red)
plt = line([xq, xq], [0, yq]);      % primitive line drawing
plt.LineWidth = 5;
hold off
title('Consumption level, T=10')