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how to combain matrix with vector
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if I have matrix a = [9 8 7; 6 5 4] and vector v = [1 2 3 4 5] I want to combaine matrix like this
[9 8 7 inf inf; ...
6 5 4 inf inf; ...
1 2 3 4 5]
thank you!!
1 个评论
回答(3 个)
KL
2017-12-12
编辑:KL
2017-12-12
Something like this?
a = [9 8 7; 6 5 4];
v = [1 2 3 4 5];
sz = size(a);
a = [a inf(sz(1),size(v,2)-sz(2));v]
4 个评论
KL
2017-12-12
编辑:KL
2017-12-12
I agree with Jan.
@Birdman: Usually when you see a homework, doit4me tag (tagged by volunteers), you could choose not to answer or you could give them some hints rather than explicit answers.
For example the one on the below link was clearly a copy-paste of homework question, a typical doit4me.
Steven Lord
2017-12-12
And if it sounds like it may be homework but you're not certain, you can gently nudge the poster into offering more information. I tend to use something like "If you show us what you've already tried we may be able to offer some suggestions for how to proceed." to do that nudging.
Andrei Bobrov
2017-12-12
编辑:Andrei Bobrov
2017-12-12
a = [9 8 7; 6 5 4];
v = [1 2 3 4 5];
z = {a;v};
[ii,jj] = cellfun(@size,z);
n = max(jj);
out = cell2mat(arrayfun(@(x,y,k)[z{x},inf(k,n - y)],(1:numel(z))',jj,ii,'un',0))
or
a = [9 8 7; 6 5 4];
v = [1 2 3 4 5];
z = {a;v};
m = numel(z);
[ii,jj] = cellfun(@size,z);
n = max(jj);
i2 = cumsum(ii);
i1 = i2 - ii + 1;
out = inf(sum(ii),n);
for ii = 1:m
out(i1(ii):i2(ii),1:jj(ii)) = z{ii};
end
1 个评论
Jan
2017-12-12
编辑:Jan
2017-12-12
a = [9 8 7; 6 5 4];
v = [1 2 3 4 5];
out = padcat(a(1, :), a(2, :), v);
out(isnan(out)) = Inf;
Or write a function by your own:
% UNTESTED !!!
function Out = CatPadding(Dim, varargin)
In = varargin;
S1 = cellfun('size', In, 1);
S2 = cellfun('size', In, 2);
c = 1;
if Dim == 1
Out = Inf(sum(S1), max(S2));
for k = 1:numel(In)
Out(c:c+S1(k)-1, 1:S2(k)) = In{k};
c = c + S1(k);
end
elseif Dim == 2
Out = Inf(max(S1), sum(S2));
for k = 1:numel(In)
Out(1:S1(k), c:c+S2(k)-1) = In{k};
c = c + S2(k);
end
else
error('Only Dim=1 and Dim=2 implemented yet.')
end
And:
a = [9 8 7; 6 5 4];
v = [1 2 3 4 5];
Out = CatPadding(1, a, v)
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