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plot condition number

release/4.3a0
cbeall3 2014-07-11 08:58:45 -04:00
parent a7ccc27b3e
commit 5f3217ccf8
1 changed files with 45 additions and 4 deletions
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49
matlab/unstable_examples/TransformCalProjectionFactorIMUExampleISAM.m
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@ -14,7 +14,7 @@ clear all;
clc;
import gtsam.*
write_video = true;
write_video = false;
if(write_video)
videoObj = VideoWriter('test.avi');
@ -43,7 +43,7 @@ IMU_metadata.IntegrationSigma = 1e-1;
curvature = 5.0;
transformKey = 1000;
calibrationKey = 2000;
steps = 20;
steps = 30;
fg = NonlinearFactorGraph;
initial = Values;
@ -210,6 +210,36 @@ for i=1:steps
marginal = isam.marginalCovariance(calibrationKey);
marginal_fx(i)=sqrt(marginal(1,1));
marginal_fy(i)=sqrt(marginal(2,2));
%% Compute condition number
isam_fg = isam.getFactorsUnsafe();
isam_values = isam.getLinearizationPoint();
gfg = isam_fg.linearize(isam_values);
mat = gfg.jacobian();
c(i) = cond(mat, 2);
mat = gfg.augmentedJacobian();
augmented_c(i)= cond(mat, 2);
for f=0:isam_fg.size()-1
nonlinear_factor = isam_fg.at(f);
if strcmp(class(nonlinear_factor),'gtsam.TransformCalProjectionFactorCal3_S2')
gaussian_factor = nonlinear_factor.linearize(isam_values);
A = gaussian_factor.getA();
b = gaussian_factor.getb()
% Column 17 (fy) in jacobian
A_col = A(:,17);
if A_col(2) == 0
pause
end
end
end
end
@ -218,7 +248,8 @@ for i=1:steps
hold off;
clf;
subplot(3,1,1:2);
figure(1);
subplot(4,1,1:2);
hold on;
%% plot the integrated IMU frame (not from
@ -253,7 +284,7 @@ for i=1:steps
fxs(i) = fx;
fys(i) = fy;
subplot(3,1,3);
subplot(4,1,3);
hold on;
p(1) = plot(1:steps,repmat(K.fx,1,steps),'r--');
p(2) = plot(1:i,fxs,'r','LineWidth',2);
@ -267,6 +298,16 @@ for i=1:steps
plot(2:i,fys(2:i) + marginal_fy(2:i),'g-.');
plot(2:i,fys(2:i) - marginal_fy(2:i),'g-.');
subplot(4,1,4);
hold on;
title('Condition Number');
plot(2:i,c(2:i),'b-');
plot(2:i,augmented_c(2:i),'r-');
% figure(2);
% plotBayesTree(isam);
end