How to plot the shadow in the 'surf' plot in Matlab?

1. Follow these hints: Thanks to the 'shadowplot' function from Mathworks.

z = magic(100);

surf(z);

shading interp;

shadowplot x;

shadowplot y;

xlabel('xMagic','rot', 14,'fontweight','bold','fontsize',12); 

ylabel('yMagic','rot', -20,'fontweight','bold','fontsize',12);

zlabel('zMagic','fontweight','bold','fontsize',14);

Example of Shadow plot:

2. The shadowplot x and shadowplot y demand 'x' and 'y' to be monotonically increasing. Due to Matlab's floating point representation problem (clearly explained HERE), we will not get monotonically increasing number even when we use: dx = 0: 0.01:1; This can be checked by:

dx = 0:0.01:1;
figure;
plot(diff(dx));

This will become a problem to use 'shadowplot'. One method that could be used is:

a. Plot the 3-D space
surf(corrValues); % instead of surf(x,y, corrValues);
shading interp;
shadowplot y;
shadowplot x;

%Now the plot x and y indices will be integers starting from 1 to size(corrValues) respectively. Off course, there will be (0,0) point but corrValues are not pointed at this point.


b. Now to have the x- and y-axis labelling as desired, instead of integers, following method could be used:

% Get the string from the number array
for ii = 1:2:length(xx)
   xTickLabel1(ii).a = num2str(xx(ii), 4);
end

xlbl = {xTickLabel1.a};

for ii = 1:1:length(yy)
 yTickLabel1(ii).a = num2str(yy(ii), 4);
end

ylbl = {yTickLabel1.a};

% Set the grid-lines -- x and y indices where grid lines to be shown
set(gca, 'XTick',[1:1:length(xx)]);
set(gca, 'YTick',[1:1:length(yy)]);
% Label the grid-lines that are selected above.
set(gca,'XTickLabel',xlbl)
set(gca,'YTickLabel',ylbl)

How to give names to each indices of an axis in Matlab?

Taken from Matlab help:

x = -pi:.1:pi;
y = sin(x);
p = plot(x,y)

set(gca,'XTick',-pi:pi/2:pi)

set(gca,'XTickLabel',{'-pi','-pi/2','0','pi/2','pi'})

xlabel('-\pi \leq \Theta \leq \pi')

ylabel('sin(\Theta)')

title('Plot of sin(\Theta)')

How to change the GRID size and Grid labels (of x, y, and z axis indices) in Matlab Plots?

1 . Simplest command is:

>> grid minor


2. If we need to customize the grid-line locations, then

a. Equal spacing:

set(gca,'xtick',[0:13:100])
set(gca,'ytick',linspace(-50,50,0))

b. Unequal spacing

xGrid = [-5 -2 -0 4 6 9]; %This need not cover the entire range of x. Where ever %grid-lines are needed we can have

set(gca,'ytick',[-50:2:0])

set(gca,'xtick',xGrid)

c. Example of playing with grid size and grid labels
%Code search space (x-axis) indices
xx = codeChipInd-1;
for ii = 1:2:length(xx)
  xTickLabel1(ii).a = num2str(xx(ii).*(fCode/fSamp), 4);
end
xlbl = {xTickLabel1.a};

%Frequency search space (y-axis) indices
yy = freqSearchRange(1:1:end);
for ii = 1:1:length(yy)
  yTickLabel1(ii).a = num2str(yy(ii), 4);
end
ylbl = {yTickLabel1.a};

% Set the grid-lines -- x and y indices where grid lines to be shown
%Define the grid-line locations
set(gca, 'XTick',[1:1200:length(xx)]); % selecting every 1200 samples (100 chips) (12.276 MHz Fs=> 12 samples per code)

set(gca, 'YTick',[1:10:length(yy)]); %selecting every 10 frequency bin

% Label the grid-lines that are selected above.
set(gca,'XTickLabel',xlbl(1:1200:end))
set(gca,'YTickLabel',ylbl(1:10:end))

GPS Acquisition: Delay and Frequency search space