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The Maxima on-line user's manual

Algebra Calculator

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Read_hashed_array

Function: read_hashed_array (<S>, <A>)

array (A, 2, 3);
read_array (file_search ("array.data"), A, comma);
arraylist (A);
A;
read_hashed_array (file_search ("array.data"), B, comma);
arraylist (B);
B[Schmidt];

Function: read_hashed_array (<S>, <A>, <separator_flag>) Reads the source <S> and returns its entire content as a hashed array. The source <S> may be a file name or a stream.

read_hashed_array treats the first item on each line as a hash key, and associates the remainder of the line (as a list) with the key. For example, the line 567 12 17 32 55 is equivalent to A[567]: [12, 17, 32, 55]$. Lines need not have the same numbers of elements.

The recognized values of <separator_flag> are comma, pipe, semicolon, and space. If <separator_flag> is not specified, the file is assumed space-delimited.

(%o1)                                true
(%i2) 

Related Examples

array-arrayinfo

array (name, 2,3,4,5,6);

arrayinfo(name);

Calculate

array-listarray

array(a, 5, 1);

a [1,1] : 5;

listarray(a);

Calculate

array-arrayinfo-listarray

m : 2;

array(a, m, 1);

a [0,0] : 1;

Calculate

array-do-if-listarray-plot2d-sin
plot2d([f,[discrete,pointx,pointy],[discrete,rx,ry]],[x,0,6.28],[style,lines,points,points],[legend,"sin(x)","",""]);

array([rs,rsy],float,5);

i:0;

f(x):=sin(x);

Calculate

array

array(a, 1,2);

Calculate

array-expand-plot2d
plot2d([[discrete, p],f(x)], [x,0.7,3.2], [style, points, lines],  [color, red, blue], [point_type, asterisk],  [legend, "data", "approximation"], [xlabel, "x"], [ylabel, "y"]);

p:[[1.2,0.53],[1.6,2....

n:6;

array (d, n, n);

Calculate

array-cos-do-load

load(fft);

y(t):=cos(2*%pi*10*t);

array(ra, float, 31);

Calculate

array-do-if-listarray-plot2d-sin
plot2d([f,[discrete,rx,ry]],[x,0,6.28],[style,lines,points]);

array([rs,rsy],float,5);

i:0;

f(x):=sin(x);

Calculate