plot repeating x values

I have 2 vectors

m =

[0.05

0.06

0.08

0.10

0.15

0.25

0.35

0.45

0.35

0.25

0.15

0.10

0.08

0.06

0.05];

and

d = [

0.0340

0.0390

0.0495

0.0565

0.0735

0.0995

0.1205

0.1465

0.1270

0.1040

0.0760

0.0590

0.0510

0.0420

0.0360];

When I use plot(m,d) I get 2 overlapping lines. How do I get the plot showing the x axis from .05 to .45 to .05 symetrically instead of overlapping?

Answer 1

[Ameer Hamza]

For that, you will need to modify the m-vector

[~, idx] = max(m);
m(idx+1:end) = 2*m(idx)-m(idx+1:end);

ax = axes();
plot(m, d);
ax.XTick = 0.05:0.1:0.85;
ax.XTickLabel = [0.05:0.1:0.45 0.35:-0.1:0.05];

[Christopher Tran Rojas]

Thank You, but the x axis is showing 0 to .9 instead of 0 up to .45 and back to 0.

[~, idx] = max(m);
m(idx+1:end) = 2*m(idx)-m(idx+1:end);
plot(m,d,'-x')
grid on

[Ameer Hamza]

Check the updated code.

Answer 2

[Robert U]

Hi Christopher Tran Rojas,

you have to replace the xTickLabel-Strings. Otherwise an increasing value vector is expected. Plus, you have to take into account that your x-axis-values are not equally distributed.

m = [0.05 0.06 0.08 0.10 0.15 0.25 0.35 0.45 0.35 0.25 0.15 0.10 0.08 0.06 0.05];
d = [0.0340 0.0390 0.0495 0.0565 0.0735 0.0995 0.1205 0.1465 0.1270 0.1040 0.0760 0.0590 0.0510 0.0420 0.0360];

plotVecX = m-max(m);
plotVecX([false diff(plotVecX)<0]) = -plotVecX([false diff(plotVecX)<0]);

fh = figure;
ah = axes(fh);
plot(ah,plotVecX,d);
ah.XMinorGrid = 'on';
ah.XGrid = 'on';
ah.YMinorGrid = 'on';
ah.YGrid = 'on';

xTickVec = ah.XTick;

xTickVec(xTickVec>0) = -xTickVec(xTickVec>0);
xTickVec = xTickVec + max(m);

ah.XTickLabel = cellfun(@num2str,num2cell(xTickVec),'UniformOutput',false)';

Kind regards,

Robert